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【单选题】
Why is Lego trying to reuse its plastic Legos?A.
because materials for making plastic are hard to find
B.
because plastic is not safe for kids to play with
C.
because plastic is expensive to make
D.
because plastic is bad for the environment
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反馈参考答案：
举一反三
【单选题】We were able to () the error and have credited your account.
A.
track out
B.
track down
C.
track over
D.
track up
【单选题】I went along thinking of nothing ________, only looking at things around me,
A.
in particular
B.
in harmony
C.
in doubt
D.
in brief
【简答题】图示 3 个回路中各溢流阀的调定压力分别为1 P Y1 =3MPa, 2 P Y2 =2MPa , 3 P Y3 =4MPa ,问在外负载无穷大时,泵的出口压力 p p 各为多少?
【判断题】Planning early may not only help you stay on track but also allow you to spread out the work.
A.
正确
B.
错误
【单选题】I finally ___ the reference in a dictionary of quotations.
A.
track out
B.
track down
C.
track up
D.
trace down
【单选题】We get so wrapped up in _____ activities that it's tough to stay on track sometimes.
A.
indifferent
B.
mundane
C.
original
D.
sophisticated
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