下列进行适当的组合投资时，常常能较好地分散投资风险，因此被视为组合投资中不可或缺的重要组成部分的是( )。
A. 债券基金，保本基金
B. 保本基金，股票基金
C. 债券基金，股票基金
D. 混合基金，股票基金
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He has just broken his leg. He knows that a trip to Europe this winter is()
A. in question
B. without question
C. beyond question
D. out of the question
The formula i+1 put forward by Krashen means input that contains structures ______ the learner's present level.
A. greatly above
B. greatly below
C. somewhat above
D. somewhat below
下列关于调整脏腑的描述，错误的是（）
A. 虚则补其母
B. 实则泻其母
C. 脏病治腑
D. 腑病治脏
E. 脏腑同治
The book which is written by Krashen and Terrell is （）.
A. Language
B. The Pronunciation of English
C. The Natural Approach: Language Acquisition in the Classroom
D. Syntactic Structures
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