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【单选题】
为使观众厅声音均匀,宜采用( )顶棚。A.
分层式
B.
波浪形
C.
连片形
D.
悬挂式
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反馈参考答案：
举一反三
【判断题】Forests cover more than half of the scenic area and much of the area not covered is above the tree line.
A.
正确
B.
错误
【单选题】Farmers shouldn't keep _____ the forests but should continue _____ more trees. [ ]
A.
cut down, plant
B.
cutting down, to plant
C.
to cut down, to plant
D.
to cut down, planting
【单选题】Forests of pine and fie cover two thirds of this area.
A.
Forests of pine and fir is covered two thirds of this area.
B.
Two thirds of this area are covered by forests of pine and fir.
C.
Two thirds of this area is covered by forests of pine and fir.
D.
This area is covered two thirds of forests of pine and fir.
【单选题】More than ______ is to be found in the rain forests.
A.
30% of the world's species
B.
60% of the world's species
C.
60% of the world's plants
【单选题】In many countries more and more forests and even agricultural land are being lost to development, _______ much of the land to become desert.
A.
caused
B.
causing
C.
having caused
D.
to cause
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