以下属于侵权责任的构成要件的是（）。
A.三个要件
B.损害事实
C.因果关系
D.客观过错
E.违法行为
参考答案：B, C, E
组成染色体的物质是（ ）
①蛋白质 ②碱性染料 ③糖类④无机盐 ⑤水⑥脂类 ⑦DNA．
A．①②
B．③④
C．⑤⑥
D．①⑦
The agency, （） to set and enforce health standard for American workers, has been promising a cotton dust standard for several years.
A. which is
B. which it is
C. whose job it is
D. of whose job is
