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【单选题】
下列关于共轭酸碱对的说法，正确的是A.
共轭酸的酸性越强，共轭碱的碱性就越强
B.
共轭酸的酸性越强，共轭碱的碱性就越弱
C.
共轭酸的酸性和共轭碱的碱性相当
D.
不确定
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【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】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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