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【单选题】
激活胰蛋白酶原的主要物质是( )A.
乙酰胆碱
B.
肠激酶
C.
弹性蛋白酶
D.
蛋白酶
E.
胃蛋白酶
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【简答题】 We don’t eat vegetable just because we like them but also because they contain special substances called vitamins which are good for use and very important if we are to be healthy.
【单选题】Take some as fruit after the meal if you like, although people often eat them as vegetable.
A.
a tomato
B.
tomato
C.
tomatos
D.
tomatoes
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A.
devoted to
B.
addicted to
C.
accustomed to
D.
exposed to
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A.
benefit
B.
benefited
C.
beneficial
D.
benefits
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【简答题】12 Conversation Two Questions 12 to 15 are based on the passage you have just heard. 12.A) Since he found a girlfriend. B) Since he look to heavy smoking. C) Since he began to exercise regularly. D) S...
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