单项选择题

A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
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单项选择题
A．Mary earned the prize.B．Mary has granted the prize..C．Mary fails in the speech contest.D．Mary shouldn’t earn the prize.
A．Mary earned the prize.
B．Mary has granted the prize..
C．Mary fails in the speech contest.
D．Mary shouldn’t earn the prize.
单项选择题
A．Alan thought Sally was too hard on Alex.B．Alan liked Alex very much and would write him a very good reference.C．Alan would turn down Alex’s request.D．Alan could see something good even in a very bad person.
A．Alan thought Sally was too hard on Alex.
B．Alan liked Alex very much and would write him a very good reference.
C．Alan would turn down Alex’s request.
D．Alan could see something good even in a very bad person.
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