I often say _____________ myself " I should study English well."[ ]
A. in
B. for
C. to
答案:C
China's new food law provides for a food recall system________ producers have to stop production if their food isn't up to standards.[ ]
A.where
B.that
C.when
D.which
化脓性脑膜炎脑脊液出现凝块,常在脑脊液静置()。
A.0~1h内
B.1~2h内
C.2~12h内
D.12~24h后
E.24~36h后