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【单选题】
以下哪个不是三羧酸循环的关键酶A.
柠檬酸合酶
B.
异柠檬酸脱氢酶
C.
苹果酸脱氢酶
D.
α-酮戊二酸脱氢酶复合体
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【简答题】Scientists resist talking about their options because they don't want people to
【单选题】After collecting the last Martian dust particle，the scientists have started to build up a portrail gallery of it．
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Scientists started to______the Anartica in the 19th century.
A.
explode
B.
explore
C.
expose
D.
expand
【单选题】Scientists don’t think that a warm winter always has a negative influence on our life,____?
A.
don’t they
B.
do they
C.
hasn’t it
D.
has it