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【单选题】
下列说法错误的是A.
C2H6和C4H10一定是同系物
B.
C2H4和C4H8一定都能使溴水退色
C.
C3H6不只表示一种物质
D.
单烯烃各同系物中碳的质量分数相同
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举一反三
【单选题】London underground is now underground transport system in the world, and Moscow Metro is underground system in the world.
A.
the largest; very busy
B.
the larger; the busier
C.
large; busy
D.
the largest; the busiest
【单选题】It __ that Moscow Metro is the busiest underground system in the world.
A.
turns over
B.
turns out
C.
turns on
D.
turns off
【简答题】Moscow
Metro system is _______ the most successful means of transportation, _____ a
popular place of interest.A. not only...and B. not only...but C. not ...but D. not ...or
【简答题】Moscow Metro is (busy) underground system in the world.
【单选题】It _________that Moscow Metro is the busiest underground system in the world.
A.
turns off
B.
turns out
C.
turns on
D.
turns over
【简答题】How is it different from bus? Fill in the chart . characteristics metro bus
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