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【多选题】
混凝土结构的优点包括（ ）A.
耐久性好
B.
抗裂性好
C.
整体性好
D.
自重轻
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举一反三
【单选题】Some parts of the Earth is warm and some are cold because______.
A.
a lot of the heat is reflected
B.
there are clouds and dust in the air
C.
different parts of the Earth receive and reflect different amount of heat
D.
different parts of the Earth have different sources of heat
【单选题】______to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
A.
Orientation
B.
Access
C.
Procession
D.
Voyage
【单选题】Some people in parts of the world are wasting food ______ some others haven't any.
A.
since
B.
when
C.
as
D.
while
【单选题】Some parts of the water are very shallow. But in some places it is very very___________.
A.
deep
B.
high
C.
cold
D.
dangerous
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