A.菌群失调
B.肠毒素使腺苷环化酶活性增加
C.细菌侵袭肠粘膜所致
D.内毒素作用于肠粘膜
E.肠蠕动加快
第3题
A、Because she is overweight.
B、Because she has started exercising.
C、Because she has a bad cold.
D、Because she has a cough.
第4题
A、Because she is overweight.
B、Because she has started exercising.
C、Because she has to do housework.
D、Because her leg was hurt.
第5题
Geraldine started her sandwich business because she
A.had always wanted to work with food.
B.recognised a good business opportunity.
C.was unsuccessful as a journalist.
第6题
Which statement is NOT true?
A.It was the doctor who cured Savage.
B.If it hadn't been because of the doctor, Savage might have died.
C.The doctor sent bills to Savage for money.
D.The doctor himself came to see Savage again.
第7题
The author was so fearful about vomiting that she even______.
A.couldn’t go to sleep
B.had to sleep on her parents' bed
C.couldn't stand hearing the words "throw up"
D.felt that something had gong wrong with her head
第8题
The author was so fearful about vomiting that she even ______.
A.couldn't go to sleep
B.had to sleep on her parents' bed
C.couldn't stand hearing the words "throw up"
D.felt that something had gong wrong with her head
第9题
She started to work _____ a will .
A.in
B.against
C.with
D.for
第10题
A.Partly because she was beautiful.
B.Partly because she was nice.
C.Partly because she was humorous.
D.Partly because she was generous.
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