What is the passage mainly about
A. The exhaust system of a car.
B. Waste gas.
C. The car engine.
D. Air pollution.
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According to the passage, which of the following was wind energy first used for
A. Pumping water.
B. Electricity.
C. Propelling ships.
D. Grinding grain.
流动资金是指为维持生产所占用的全部周转资金，它是( )。
A. 现金与银行存款的总和
B. 全部货币资金
C. 流动资产与流动负债的差额
D. 资产与负债的差额
After the right time for learning a language has passed, ______.
A. you can only learn to write and read it
B. you can hardly learn to speak it as well as a native
C. you cannot detect the subtle differences between sounds
D. you cannot work tongue, throat, and lips to control breathing
Soon after the drug ______ effect, the patient became quieter.
A. brought
B. made
C. took
D. released
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