题目内容

词汇与结构A fire or smoke in the cabin should be controlled by identifying and _______ the faulty system.

A. engaging
B. removing
C. shutting down
D. activating

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词汇与结构If smoke increases in _______ when the cabin air vents are opened, they should be immediately closed.

A. visibility
B. intensity
C. stability
D. readability

词汇与结构The pilot should also be aware that on some airplanes, lowering the landing gear and/or wing flaps can _______ a cabin smoke problem.

A. aggravate
B. facilitate
C. deteriorate
D. alleviate

劳动二重性是指( )

A. 死劳动和活劳动
B. 脑力劳动和体力劳动
C. 简单劳动和复杂劳动
D. 具体劳动和抽象劳动

“劳动是财富之父, 土地是财富之母”。对这句话的正确理解应该是( )

A. 劳动和土地是价值的源泉
B. 劳动创造使用价值, 土地形成价值
C. 劳动是创造价值的外部条件, 土地才是价值的真正源泉
D. 劳动不是它所生产的使用价值即物质财富的惟一源泉