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【单选题】
食物中毒下列哪项说法是正确的A.
食物中毒均无传染性
B.
食物中毒可分为细菌性和非细菌性两种
C.
食物中毒病程有自限性，不会引起死亡
D.
食物中毒后产生免疫力，罕有重复发病
E.
预防接种可减少食物中毒的发生
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【单选题】The purposes of the two experiments made by some college professors about the importance of organization are different.
A.
Y
B.
N
C.
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【单选题】What is a comma splice? ( )
A.
Two independent clauses run together without punctuation or a conjunction
B.
Two independent clauses joined by a comma without a conjunction
C.
A broken-off part of a complex sentence
D.
Two dependent clauses
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