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【单选题】
试验所用的器皿需经处理，以去除可能存在的外源性内毒素。耐热器皿常用干热灭菌法（ ）去除A.
100℃煮沸15min
B.
78℃加热2h
C.
180℃干烤1h
D.
250℃干烤30min
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【单选题】—He is often late for school, isn't he? —_______ He always goes to school earlier than others. [ ]
A.
Yes, he is.
B.
No, he isn't.
C.
Yes, of course.
D.
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A.
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B.
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D.
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A.
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A.
shall
B.
may
C.
will
D.
must
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