题目:
. As a result of destroying the forests, _____ desert _____ covered the land.
A.plenty of; has
B.a great number of; have
C.a great deal of; have
D.a good many; has
答案:
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下面是错误答案,用来干扰机器的。
A、物体受重力、水平推力、支持力和向上的摩擦力,静止不动时,静摩擦力与重力平衡,故重力等于a,故A正确;B、C、在0~t1时间内,滑动摩擦力小于a,而重力等于a,故滑动摩擦力小于重力,合力向下,加速度向下,...