2. 外语
  3. Both cowbird and cuckoo chicks______. According to the study by Dr. Hoover and Dr. Robinson, nests______.

Both cowbird and cuckoo chicks______. According to the study by Dr. Hoover and Dr. Robinson, nests______.

admin2009-06-24  8
问题 Both cowbird and cuckoo chicks______.
According to the study by Dr. Hoover and Dr. Robinson, nests______.
选项 A、which were parasitised by cowbirds failed to produce young birds.
B、which denied cowbirds access did no better than unprotected ones.
C、which had no cowbird eggs but remained unprotected did the worst.
D、with a cowbird egg in them produced the least young.
答案C
解析
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