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【单选题】
葡萄球菌肠毒素的作用是A.
直接破坏胃粘膜细胞,导致腹泻、腹痛
B.
直接毒害肠粘膜细胞,导致腹泻、腹痛
C.
直接毒害中枢神经,引起食物中毒
D.
通过刺激呕吐中枢而导致呕吐
E.
直接破坏肠壁血管,导致出血性肠炎
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举一反三
【单选题】We believe _______ you have been devoted to ________ naturally of great necessity．
A.
that; being
B.
all that; be
C.
that all; are
D.
what; is
【单选题】——Why not stop for a break now? —— _____ .We have been busy working all day and all of us are tired.
A.
I couldn’t agree more
B.
That’s all right
C.
We’d better not.
D.
You’re really right.
【单选题】Most people interviewed said: “We have been warned all about the effects of sunbathing, yet we keep putting ourselves ___ .”
A.
at play
B.
at risk
C.
at peace
D.
at work
【判断题】风险越大,风险附加费就越大,风险附加费太高对合同双方均不利,一方面业主必须支付较高的合同价格,另一方面承包方的报价太高也会失去竞争力,导致其难以中标。
A.
正确
B.
错误
【单选题】- Where have you been all day? - We _________ some beautiful children and we couldn’t get away from them until it was dark．
A.
meet
B.
have been met
C.
met
D.
have been meeting
【简答题】The pe ace talk is an important development on the peace process, _____ we have all been waiting for a long time . [ ] A . one B. what C. it D. that
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