42. a kind of birds return very early this spring, because the spring came early this year.but because of the lack of insect, the birds have less food, however, the birds thrive. ask the explanation. i choose the number of predators of the birds have been influenced too.
I think a choice saying that birds has successfully sought other sources of food instead of insects would be better
我的观点也同意 birds has successfully sought other sources of food instead of insects would be better。 因为这个更贴近题目。
61.由于飞机在一种cloud的情况下,会翅膀上结冰,或其他地方结冰,对飞机有危险. 有人建议在机场附近安装一种设备,能够检测飞机上结冰情况,警告飞行员. 哪个支持? A. 飞机一般不遇到这种结冰,除非升降时. B. 机场天气预报能有效预测什么地方没有cloud C. 设备太大,不能在飞机上安装. 其他不对了.我最后选A
42.我认为应选the number of predators of the birds have been influenced too. 因为题目已经说了the birds have less food, 也就是说即使birds 找了另外的食物来源, 但与昆虫的下降抵销后, 总体的食物来源还是下降的.
以下是引用kathy72在2003-10-28 0:22:00的发言: 42.我认为应选the number of predators of the birds have been influenced too. 因为题目已经说了the birds have less food, 也就是说即使birds 找了另外的食物来源, 但与昆虫的下降抵销后, 总体的食物来源还是下降的.