单项选择题
（）using the derrick at once, the gosseneck is bent.
A.Continue
B.Start
C.Commence
D.Stop
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（）will the discharging operations take?
A.How long
B.How length
C.How many times
D.How many shift -
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（）your present speed?
A.How is
B.How are
C.What is
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单项选择题
A bad separation makes the cargo（）at its destination.
A.easier to discharge
B.more difficult to discharge
C.easierto load
D.more difficult to load
