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【单选题】
In a _____ the center screw is driven and the outer screws idle.A.
single screw pump
B.
double-screw pump
C.
triple screw pump
D.
centripetal pump
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举一反三
【单选题】What does the boy want to be?
A.
He wants to be successful.
B.
He wants to be like his father.
C.
He wants to be a doctor.
【单选题】The poor boy loves playing ________ football, and he really wants to have ________.
A.
the, a
B.
/, one
C.
the, one
【单选题】There is a boy student downstairs ______.
A.
wants to see you
B.
whom wants to see you
C.
which wants to see you
D.
he wants to see you
【简答题】根据句意，补全单词。 1. The boy wants his father to buy a _____ plane for him as a birthday present. 2. We often play s or go fishing in our _____ time after school. 3. We know Obama is the youngest _____ o...
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