A．promiseB．introduceC．encourageD．require
A. promise
B. introduce
C. encourage
D. require
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已进境的展览品在某些情形下不需要缴纳进口税。这些情形包括：___________。
What do critics on the right say about the proposed point system？
A. It opposes family unity.
B. It is very difficult to apply.
C. It does not meet the needs of high-tech employers.
D. It opposes American values.
Which of the following interested the researchers most？
A. The mice that started dieting in old age。
B. 27 0f those 46 0ld genes that continued to behave like young ones．
Calorie restriction that works in people．
Dieting that makes sure a drug is effective．
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