He’S working hard for fear that he_________．
A. should fall behind
B. fell behind
C. may fall behind
D. would fall behind
查看答案
设集合M={x|x≥-3}，N={x|x≤1}，则 M ∩ N=（） (A)R (B)(-∞，-3]u[1，+∞) (C)[-3，-1] (D)φ
The case_______．
A. lay fight on one side of ashelf
B. was right behind as oldbrown-looking case
C. was between two highshelves
D. was among the hundreds ofcases
答案为：
A. substantial
B. material
C. substantive
D. important
经过点B(0，3)且与直线x+2y-3=0垂直的直线方程为（） (A)2x-y-3=0 (B)y-2x-3=0 (C)x+2y-6=0 (D)2x+y-3=0
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