题目内容

三羧酸循环的第一步反应产物是

A. 草酰乙酸
B. 柠檬酸
C. 乙酰CoA
D. NADH+H+
E. 丙酮酸

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______ orbits the Sun, Uranus rotates on its axis, an imaginary line through its center.

A. For it
B. It
C. As it
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I am interested in ______ you have told me.

A. which
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C. all what
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下列真菌中最易侵犯脑组织的是

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The author recommends that young people ______.

A. check blood hemoglobin yearly
B. be on a strictly vegetarian diet
C. lose weight
D. do some more studies on hemoglobin

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