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【单选题】
What is the fifth paragraph mainly about?A.
Why people become short-sighted.
B.
Why natural light has a special chemical.
C.
Why playing outside is good for one’s eyesight.
D.
Why daylight is much brighter than indoor light.
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反馈参考答案：
举一反三
【单选题】What’s wrong about the narration of Km
A.
is the characteristic constant of the enzyme
B.
The substrate constration when V= Vmax / 2
C.
The greater the Km, the smaller the affinity of the enzyme to the substrate
D.
Independent of the enzyme-catalyzed substrate
【单选题】一.单项填空。 ( ) 1.What's wrong with you ? I've _____a headache.
A.
get
B.
got
C.
has
D.
have
【单选题】选择正确的答句回答问题。 1.What’s wrong with you? ___________________________________________________
A.
I’m not well.
B.
I have a toothache.
C.
Yes, he is.
D.
Yes, she did.
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