缺氧池的溶解氧要求控制在（）
A、＜0.1mg/L
B、＜0.5mg/L
C、＜1mg/L
D、＜1.5mg/L
参考答案：B
5，6-磷酸果糖激酶最强的变构激活剂是（）
A.ATP
B.AMP
C.ADP
D.2，6-二磷酸果糖
E.1，6-二磷酸果糖
A huge amount of environmental damage has been _____ by the destruction of the rainforests.
A．brought up
B．brought about
C．brought down
D．brought out
