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问题 选择题

Alice spent much time _____ the piano each day.                                                  

A．to practice playing

B．practicing playing

C．to practice to play

D．practicing to play

答案

答案：B

题目分析：考查动名词的用法：句意：爱丽丝每天花了很多时间弹钢琴。使用了词组：Spend time（in） doing sth，和practise doing sth，选B。

单项选择题

The United States Food and Drug Administration (FDA) regulates the introduction of new therapeutic agents into the marketplace. Consequently, it plays a critical role in improving health care in the United States. While it is those in the academic and government research communities who engage in the long process of initial discovery and clinical testing of new therapeutic agents, it is the FDA’s role and responsibility to facilitate the transfer of new discoveries from the laboratory to the marketplace. Only after the transfer can important new therapies help patients.
Which one of the following statements can be inferred from the passage

A．The FDA is responsible for ensuring that any therapeutic agent that is marketed is then regulated.

B．Before new therapeutic agents reach the marketplace they do not help patients.

C．The research community is responsible for the excessively long testing period for new drugs, not the FDA.

D．The FDA should work more closely with researchers to ensure that the quality of therapeutic agents is maintained.

E．(E) If a new medical discovery has been transferred from the laboratory to the marketplace, it will help patients.
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问答题 简答题

快锅正常燃烧时，水位正常，但报警窗低水位报警灯总亮，如何处理？
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