第27题: [单项选择]A scientific law is liable at any time to need modifying. This happens when fact is discovered which seems to ______ what the law would lead one to expect. A. prove B. support C. contradict D. discourage 参考答案:C 答案解析:“一项科学定律随时都可能需要改进”是“(当新的事实)违背(该定律时)”时,因此选contradict“与……相矛盾”。prove证实;support支持;discourage (something)使
第28题: [单项选择]成年奶牛瘤胃的体积大约为()。 A. 50升 B. 100升 C. 200升 D. 250升 参考答案:B