服用（）可减少体内自由基。
A.氧化酶
B.过氧化氢酶
C.消化酶
D.催化酶
参考答案：B
He ________ me to come to my birthday party, but until it was over he didn’t appear at all.
A．asked
B．told
C．agreed
D．promised
动安全卫生法律制度
