与“桃李春风一杯酒”组成对偶最恰当的一句是( )。
A．树头花落未成荫
B．万草千花一晌开
C．江湖夜雨十年灯
D．风光不与四时同
参考答案：C
Paper bags produced every year are ______ the world's production of vehicles.[ ]
A. three times the weight of
B. three times weight of
C. as three times heavy as
D. three times as heavier as
电机润滑油在使用前，常温耐压不低于（）kV。
A.10
B.20
C.30
D.40
