The birth rate over the last few years______.A.li
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The birth rate over the last few years______.
A.live with their parents
B.their own decisions
C.most American families are usually small
D.the family structure
E.some similar features
F.has been dropping
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答案：F
根据第四段最后一句“The birth rate has been declining steadily in recent years.”可知，出生率近年来持续下降。F项中的“dropping”是对第四段最后一句中“declining”的同义改写。