The conditions that existed ten years ago()(reproduce)today.

Environmental conditions determine the variation of the growth of the tree.

A．Y

B．N

C．NG

A.limitations

B.conditions

C.Restrictions

D.qualifications

Some areas,______ their severe weather conditions, are hardly populated.

A．due to

B．in spite of

C．but for

D．with regard to

A．Y

B．N

C．NG

A.captured

B.old

C.new

D.original

A.limits

B.conditions

C.resources

D.identities

A．Absence of illness.

B．A long life.

C．Good conditions of living.

D．Complete satisfaction with life.

A.terms and conditions

B.termination and conditioning

C.term and condition

D.terminations and conditionings

The observation of weather conditions by satellites is advantageous be cause it ______.

A．uses electronic instruments

B．enables man to alter the weather

C．makes weather prediction easier

D．gives the scientist information not obtained readily otherwise

A.conditions

B.functions

C.materials

D.structures