Question 18
A. Vegetables differ in their nutritional value.
B. Children's eating habits can be changed.
C. Parents watch closely what children eat.
D. Children's choices of food vary greatly.
[音频]Question 19
A. Space exploration has serious consequences.
B. India has many space exploration programs.
C. There is quite a lot to learn about the moon.
D. A lot of garbage has been left on the moon.
Question 20
A. It is costly to bring back.
B. It is risky to destroy.
C. It is of no use on Earth.
D. It is damaged by radiation.
Question 21
A. Record details of space exploration.
B. Monitor the change of lunar weather.
C. Study the effect of radiation and vacuum on its materials.
D. Explore the possibility of human settlement on the moon.
[音频]Question 22
A. It is likely to remain a means of business communication.
B. It is likely to be a competitor of various messaging apps.
C. It will gradually be replaced by social media.
D. It will have to be governed by specific rules.
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