生物多样性锐减的危害在于
A．生物数量减少
B．生物遗传性状改变
C．生物适应能力下降
D．生物数量和种类都减少
E．物种减少以致灭绝
参考答案：E
The box is not ______________ that one. [ ]
A. as bigger as
B. so bigger as
C. so big as
D. bigger
一个长方体钢材，横截面的面积是1.8dm2．长是4.5m，体积是8.1dm3．______．
