为了看清近距离目标，需（）
A.增加角膜的曲率
B.环形睫状肌收缩
C.增加晶状体的曲率半径
D.增加晶状体的曲率
E.减少晶状体的曲率
参考答案：B, D
—What if he failed in the next monthly examination again?
— I don’t know. ______ heart and be reduced _____ the class?
A．Will he lose; not to attending
B．Did he lose; to not attending
C．Had he lost; not to attending
D．Would he lose; to not attending
用压力密闭流程处理油（气）田污水时，由于含油污水（）可使水质定，结垢少，腐蚀性小。
A.处于无氧状态
B.处于微氧状态
C.处于压力状态
D.处于有氧状态
