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【多选题】
铁路线路是由()组成的一个整体工程机构A.
路基
B.
桥隧建筑物
C.
轨道
D.
枕木
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皮皮学刷刷变学霸
举一反三
【单选题】Some people waste a lot of food others in the world haven’t enough to eat.
A.
． after
B.
． when
C.
． as
D.
． while
【单选题】This article shows that ______.
A.
some people are trying to solve their waste problems
B.
the government is not concerned with the problem of wastes
C.
recovered materials won't be able to compete with new materials
D.
citizens will unwillingly pay the costs of changing the waste system
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