【名词&注释】
消防车(fire engine)、水平面(horizontal plane)
[单选题]电镜下质膜呈现三层结构。( )
A. 正确
B. 错误
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举一反三：
[单选题]Which of the following might be the best title of the passage?
A. Solar Storms: An Invisible Killer
B. Solar Storms: Earth Environment in Danger
C. Solar Storms: Threatening the Human Race
D. Solar Storms: Human Activities to Be Troubled
[单选题]菊科植物花序外包被着的绿色部分是副萼。( )
A. 正确
B. 错误
[单选题]给旱区送水的消防车停于水平面，在缓缓放水的过程中，若车胎不漏气，胎内气体温度不变，不计分子势能，则胎内气体
A. 从外界吸热
B. 对外界做负功
C. 分子平均动能减少
D. 内能增加
[单选题]Progress so far very good and we are sure that the work will be finished on time.
A. was
B. had been
C. has been
D. will be
[单选题]
A. teahing
B. writing
C. studying
D. reading
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