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【简答题】
A box contains 90 jelly beans, of which some are orange, some are purple, and some are black. How many black jelly beans are in the box? (1) There are 27 orange jelly beans. (2) There are twice as many purple jelly beans as orange jelly beans.
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反馈参考答案：
举一反三
【简答题】单一水准测量路线的布设形式为附合水准路线、支水准路线、( )。
【单选题】Don't __________ the window.Listen to me carefully. [ ]
A.
look out
B.
look out for
C.
look out of
D.
look after
【单选题】Don’t ___________ the birds． Listen to the teacher carefully．
A.
look
B.
look out
C.
look out of
D.
look out at
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