皮皮学，免费搜题
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【单选题】
有关青霉素快速过敏试验法,错误的是A.
每毫升试验液500u青霉素
B.
试验液滴在电极板方形头上
C.
试验部位皮肤用注射用水擦净
D.
计时开关开5min
E.
试验部位皮肤出现白斑，也属阳性反应
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反馈参考答案：
举一反三
【单选题】Snow soon __________ on the road, and the traffic was slowing down.
A.
accumulated
B.
built
【单选题】This morning I ___ on time. But unfortunately, there was a car accident and the traffic was blocked for half an hour.
A.
was to come
B.
must have come
C.
had come
D.
was to have come
【简答题】and the traffic was really ___________ during that time.
【单选题】There ______ so many tourists and the traffic was really busy during that time.
A.
is
B.
are
C.
was
D.
were
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