In order for space tourists to walk around and function normally, it is necessary for t

hen we are working, we leave the bags tied to the wall, out of the way. At bedtime we untie them and take them wherever we’ve chosen to sleep.

On most space shuttle flights everyone sleeps at the same time. No one has to stay awake to watch over the spaceplane; the shuttle’s computers and the engineers at Mission Control do that. If anything goes wrong, the computers ring an alarm and the engineers call us on the radio.

On the space shuttle, sleep-time doesn’t mean nighttime. During each ninety-minute orbit the sun “rises ” and shines through our windows for about fifty minutes; then it “ sets ” as our path takes us around the dark side of the earth. To keep the sun out of our eyes, we wear black sleep masks.

It is surprisingly easy to get comfortable and fall asleep in space. Every astronaut sleeps differently. Some sleep upside down, some right side up. When it’s time to sleep, I take my bag, my sleep mask, and my tape player with earphones and float up to the flight deck. Then I crawl into the bag, and float in a sitting position just above a seat, right next to a window. Before I pull the mask down over my eyes, I relax for a while, listening to music and watching the Earth go by beneath me.

36、When it’s bedtime, astronauts pull their sleeping bags ________ .

A.near the windows

B.in the flight deck

C.above the seats

D.in any place they like

37、“Watch over” in para. 2 has the closest meaning to ________ .

A.take care of

B.see

C.look at

D.pay attention to

38、How long does it take for the space shuttle to go round the Earth？

A.Twenty-four hours

B.Fifty minutes

C.Ninety minutes

D.Nineteen minutes

39、According the passage, in order to get comfortable ａｎｄ fall asleep in space, it is necessary to ________ .

A.wear a sleep mask

B.listen to music

C.sleep upside down

D.sleep sideways

40、The best title for this passage is ________ .

A.bedtime doesn’t mean nighttime

B.sleeping in space

C.orbiting the Sun

D.sleeping on the space shuttle

NASA, the U.S. space agency, believes there's a good chance that we're not alone in the universe. Last fall, NASA began a new project called the High Resolution Microwave Survey (HRMS). Its aim: to find evidence of life in one of the billions of galaxies in the universe.

The search for intelligent life on other planets isn't new. It began almost 100 years ago. That's when scientists built a huge transmitter to send radio waves into space. Scientists thought smart beings on other planets might pick up the signals.

Scientists also have sent a message about humans and our solar system to a nearby constellation (星座 ). But because the constellation is 25,000 light years away, a return message wouldn't reach Earth for 50,000 years! So don't wait up for an answer.

So far, no extraterrestrial (地球外的 ) beings that we know of have returned our “ calls. ” But according to Dr. Jill Tarter, an HRMS scientist, we haven't exactly had our ears wide open. “ Now, however, ” says Dr. Tarter, “ we've built the tools we need to listen well.”

Last October, Dr. Tarter switched on the largest radio receiver in the world. It's an enormous metal bowl stretching 1,000 feet across a valley in Puerto Rico.

Meanwhile, another NASA scientist turned on a huge radio receiver in California's Mojave Desert. NASA hopes these big dishes-and others around the world-will pick up radio signals from new world.

Dr. Frank Drake has been searching for life in outer space for years. He explains the HRMS project this way: To listen to your radio, you move the tuner on the dial until the channels come in loud and clear: Now imagine radio receivers that scan our galaxy “listening” to 14 million channels every second. That's what NASA's radio receivers in Puerto Rico and California are doing.

But that's not all. Powerful computers hooked to the receivers examine every signal carefully. The computers try to match the signals to ones that scientists already recognize, such as human-made signals. If they can't, Drake and Tarter check on them. “It could prove there is radio technology elsewhere in the universe, ” says Dr. Tarter. “ And that would mean we're not alone. ” 26、NASA scientists started a new project in order to _______.

A、discover life in other galaxies

B、send human beings into space

C、find evidence of a new galaxy

D、confirm the number of galaxies

27、According to Dr.Jill Tarter ,the reason why we haven't received any return any return messages from outer space is that_______.

A、our ears are not sharp enough to hear them

B、our equipment hasn't been good enough

C、it takes millions of yuars for them to reach us

D、it takes quite a long time to send them

28、Dr.Jill Tarter compares the large receiver to _______.

A、the human ear

B、the universe

C、a metal bowl

D、a huge dish

29、According to Dr.Frank Drake ,NASA's radio receivers in Puerto Rico and California are _______.

A、trying to check on every channel carefully

B、moving the tuner on the dial for clear channels

C、scanning the universe for possible signals

D、picking up radio signals from new world

30、The best title of this passage is ________.

A、Signals from the Space

B、The Invention of New Radio Receivers

C、The Intelligent Life in Outer Space

D、NASA Listens for Space Neighbors

An administrator needs to recover disk space on a previously-used thin provisioned virtual disk.The volumes where the administrator needs to recover the disk blocks are on VAAI-compliant storage arrays. Which two actions should the administrator take accomplish this task？ ()

A.Issue the vmkfstools -vmfs unmap command within the VMFS volume directory on the ESXihost console

B.Use VMware Converter to migrate the virtual machine to a new datastore. This will recreate the volumes and recover all unused space

C.Perform. a Storage vMotion to another volume in order to force free space recovery to occur.This recreates the volume in a new location and recovers all unused space

D.Execute the esxcli storage vmfs unmap command

__________.

A.the sailors and airmen were taken away by people from space for scientific research

B.Some navigational instruments ran out of order and therefore caused the ships sinking and the planes crashing

C.the sailors and airmen could not stand the extreme weather conditions and they died natural death

D.Some sailors and airmen were inexperienced and were responsible for the accidents

nds into space. It turns out that the ionosphere (电离层), the layer of electrically charged particles that comprises the outer atmosphere, is thinner than expected-and cooler.

Understanding the shape and size of the ionosphere is an important first step in figuring out how particularly dense regions within it may distort radio, radar and navigation signals. Such distortions can make communications and satellite-based systems less reliable.

"In order to predict how severe those distortions will be, it's necessary to know how big those structures in the ionosphere are and where they exist," Roderick Hellis, with the Space sciences Center at the University of Texas in Dallas, told Discovery News.

Hellis and his colleagues have been using a suite of NASA instruments called CINDI, which fly on the U.S. Air Force Communication/Navigation Outage Forecast System (C/NOFS) satellite between 250 miles and 530 miles around the planet's equator.

The researchers never expected to encounter the edge of Earth's ionosphere at those altitudes, but that is exactly what happened during the summer of 2008, a time when the solar activity was unusually weak.

"It was a real combination of low solar activity and the satellite's range," Hellis said. "We didn't expect to be able to look at the top of the ionosphere in all places." Computer models based on previous research had predicted the ionosphere to be about 370 miles above Earth at night and about 620 miles up during the day--the variation due to temperature and other factors.

Instead, the CINDI team discovered that the transition between the ionosphere and space was about 250 miles above Earth at night and about 500 miles up during the day.

The ionosphere is primarily caused by extreme ultraviolet energy from the sun.

"It's powerful enough that those photons (光子) can ionize (使……电离) atoms in Earth's upper atmosphere," said David Hathaway, a solar physicist at NASA's Marshall Space Flight Center in Huntsville, Ala. "When you have a geomagnetic disturbance or a solar flare going off, you can get an ionosphere that is uneven, which can cause problems with radio signals and GPS satellite signals, which have to pass through."

The findings were presented at the annual American Geophysical Union conference in San Francisco last month.

CINDI is an acronym for Coupled Ion Neutral Dynamics Investigation. The device works by separately measuring ionized and neutral particles at altitudes where the Air Force satellite flies. A similar device is on another polar-orbiting Air Force spacecraft.

The researchers hope to keep using CINDI as solar activity picks up in the sun's new 11-year cycle. The next solar maximum is expected in late 2011 or 2012.

We have always had a misconception about______.

A．how far away the upper edge of the ionosphere is

B．how many particles comprise the ionosphere

C．how long the ionosphere has been existing

D．how the ionosphere extends into space

A.T

B.F

C.大

D.小

A.STR（200）

B.SPACE（5）

C.T（’人民’，’中华人民共和国’）

D.SUBSTR（’中华人民共和国’，7）

听力原文：M: Did you know that astronauts have made commercial products in space？

W: No, I wasn't aware of that. What kind of products？

M: Tiny plastic beads with a little hole through it.

W: Tiny balls？ Do you mean to tell me that astronauts have nothing better to do than make jewelry beads in space？ It seems to me they could make more useful things out there.

M: Oh, but these little balls aren't for jewelry. They can be used for scientific purposes to conduct cancer research .

W: That sounds better, but why make such objects in space rather than on earth？

M: Because earth gravitational pull affects the beads. They produced on earth are distorted, not exactly tumid. The ones made in space are precisely round.

W: Sounds reasonable.

(23)

A．Astronauts' clothing.

B．Products made in space.

C．Costume jewelry.

D．Problems in manufacturing.

war is. There are shooting wars—the kind that test patriotism and courage—and those are the kind at which the U.S. excels. But other struggles test those qualities too. What else was the Great Depression or the space race or the construction of the railroads？ If Americans indulge in a bit of flag-waving when the job is done, they earned it.

Now there is a similar challenge: global warming. The steady deterioration (恶化) of the very climate of this very planet is becoming a war of the first order, and by any measure, the U.S. is losing. Indeed, if America is fighting at all, it's fighting on the wrong side. The U.S. produces nearly a quarter of the world's greenhouse gases each year and has stubbornly made it clear that it doesn't intend to do a whole lot about it. Although 174 nations approved the admittedly flawed Kyoto accords to reduce carbon levels, the U.S. walked away from them. There are vague promises of manufacturing fuel from herbs or powering cars with hydrogen. But for a country that tightly cites patriotism as one of its core values, the U.S. is taking a pass on what might be the most patriotic struggle of all. It's hard to imagine a bigger fight than one for the survival of a country's coasts and farms, the health of its people and the stability of its economy.

The rub is, if the vast majority of people increasingly agree that climate change is a global emergency, there's far less agreement on how to fix it. Industry offers its plans, which too often would fix little. Environmentalists offer theirs, which too often amount to na; ve wish lists that could weaken America's growth. But let's assume that those interested parties and others will always be at the table and will always demand that their voices be heard and that their needs be addressed. What would an aggressive, ambitious, effective plan look like—one that would leave the U.S. both environmentally safe and economically sound？

Halting climate change will be far harder. One of the more conservative plans for addressing the problem calls for a reduction of 25 billion tons of carbon emissions over the next 52 years. And yet by devising a consistent strategy that mixes short-term solutions with far-sighted goals, combines government activism with private-sector enterprise and blends pragmatism (实用主义) with ambition, the U.S. can, without major damage to the economy, help halt the worst effects of climate change and ensure the survival of its way of life for future generations. Money will do some of the work, but what's needed most is will. "I'm not saying the challenge isn't almost overwhelming," says Fred Krupp. "But this is America, and America has risen to these challenges before."

What does the passage mainly discuss？

A．Human wars.

B．Economic crisis.

C．America's environmental policies.

D．Global environment in general.

According to Dr. Edward Hall,______.

A．the Japanese prefer crowding to privacy most of the time

B．space doesn't mean emptiness in the eyes of the Japanese

C．the Japanese dislike invasion of privacy in his house

D．the American require more space than the Japanese