地下水位应该在危险废物填埋场的不透水层( )m以下。
A．1 B．2 C．3 D．4
参考答案：C
(2014·哈尔滨质检)She has succeeded in gaining ________to the university，which the whole family are pleased with.
A．congratulation
B．admission
C．cooperation
D．reaction
Fred plays _____ piano after _____ supper every day.
A. the; the B. /; the C. the; /
