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【单选题】
According to the passage， what did the farmers have to do with the coming of mechaniza-tion of agriculture? 查看材料A.
Many of them had to leave their farmland for industrial centers．
B.
They stuck to their farm work．
C.
They refused to use machines．
D.
They did their best to learn how to use the machines．
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【单选题】The teacher told his student to make the most of the opportunities ___hand.
A.
in
B.
of
C.
at
D.
on
【单选题】1,3—戊二烯经臭氧化,在锌存在下水解,可得到哪一种产物?
A.
HCHO + OHCCHO+CH2CHO
B.
HCHO + HOOCCH2COOH
C.
HCHO + CH3COCHO
D.
CH3COCHO + CO2 + H2O
【单选题】The teacher told his students that the earth _____ round the sun. [ ]
A.
go
B.
went
C.
goes
D.
had gone
【单选题】The teacher told his students to make the most of the opportunities ( ) hand.
A.
on
B.
at
C.
to
D.
by
【单选题】The teacher told his class that the light ___ faster than the sound.
A.
travel
B.
traveled
C.
travels
【单选题】The teacher told his students that the earth___________round like a ball.
A.
be
B.
is
C.
had been
D.
Was
【单选题】1,3-戊二烯经臭氧化,在锌存在下水解,可得到哪一种产物?
A.
HCHO + OHCCHO+CH3CHO
B.
HCHO + HOOCCH2COOH
C.
HCHO + CH3COCHO
D.
CH3COCHO + CO2 + H2O
【简答题】用于衡量柱效的参数
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