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
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
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