Tourists usually choose to travel overseas.A．YB．NC．NG

A．Because they want to sell canteens.

B．Because they want to educate the tourists about park conditions.

C．Because the tourists may get sick or die from dehydration.

D．Because the tourists may get lost.

A.(—COOH)

B.(ArOH)

C.(—CHO)

D.(ROR)

Tourists focus more on places they visit than those at home.

A．Y

B．N

C．NG

A.CFO

B.CHO

C.CEO

D.CPO

A.about

B.roughly

C.as

D.around

A．To welcome the tourists.

B．To make money.

C．To keep the tourists away.

D．To attract the tourists.

A.CHO

B.-Br

C.–SO3H

D.-COOH

A.above

B.on

C.at

D.below

A．Because they want to sell canteens,

B．Because they want to educate the tourists about park conditions.

C．Because the tourists may get sick or die from dehydration.

D．Because the tourists may get lost.