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【单选题】
下列说法正确的是 [ ]A.
相对分子质量相同的物质是同一物质
B.
具有相同通式的不同物质一定属于同系物
C.
分子式相同而结构不同的有机物一定是同分异构体
D.
各种有机物都由一定的元素组成，由一定元素组成的物质只能形成一种有机物
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举一反三
【单选题】听力原文： Officials of the World Food Program, WFP, said they are receiving information that famine has gripped parts of Central Afghanistan. WFP officials say as the winter snow begins to melt and high m...
A.
melting snow begins to block the mountain paths.
B.
the Taliban have destroyed existing food stocks.
C.
the Taliban are hindering food deliveries.
D.
an emergency air-lift of food was cancelled.
【单选题】The Voice of China is such a popular program with viewers has produced many a music-lover.
A.
who
B.
that
C.
where
D.
as
【单选题】What does the writer think of the TV program?
A.
Dull.
B.
Crazy.
C.
Interesting.
D.
Serious.
【单选题】How would you describe the writer's attitude towards the Canadian immersion program?
A.
Supportive.
B.
Unenthusiastic.
C.
Balanced--prepared to weigh up the pros and cons.
D.
Critical.
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