单项选择题

When we have difficulty ______ desired objects or reaching desired goals we experience negative emotions such as grief and anger.

A．at obtaining
B．in obtaining
C．on obtaining
D．with obtaining
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单项选择题
By lip reading or watching the movements of the speaker's lips, a deaf person can actually see ______ the person at the other telephone is saying.
A．that
B．how
C．what
D．where
单项选择题
On the giant plane there are ______ the jet needs.
A．twice engines than
B．twice as engines as
C．as twice many engines as
D．twice as many engines as
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