常见的地面由( )所构成。
A.面层
B.垫层
C.基层
D.基础
E.夹层
参考答案:A,B,C
东南亚国家中面积最大、人口数量最多的是[ ]
A.泰国
B.越南
C.印度
D.印度尼西亚
If Newton lived today, he would be surprise by what () in science and technology.
A. had discovered
B. had been discovered
C. has discovered
D. has been discovered