题目内容

我买了一束鲜花，送给母亲，作为她50岁生日的lǐ物。

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Still, he could not help thinking that if anything______, the nearest person he could contact by radio, if there was a ship nearby, would be on an island 885 miles away.

A. were happening
B. should happen
C. would happen
D. had happened

Statistics from the developed countries suggest that it is only when peoples living standards begin to rise______to fall.

A. can birth rate begin
B. that birth rate begins
C. that birth rate should begin
D. then birth rate begins

Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their

A. is
B. are
C. that is
D. those are

A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind.

A. to have been studied
B. to be studied
C. having been studied
D. being studied