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【多选题】
在微生物细胞中,完成对代谢流的适当调节控制的是参与代谢速度调节作用的调节酶,它们主要是处在代谢途径中的哪些调节作用点:A.
异质代谢系（如糖、氨基酸、脂肪等）转换点
B.
最终生成产物的生化反应的酶
C.
不可逆步骤的酶
D.
分支途径的第一个酶
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【单选题】听力原文：New York City: The United States National Weather Service says that the huge winter storm has dumped some 68.3 centimeters of snow in Central Park, making it the worst blizzard to hit New York Ci...
A.
Blizzard.
B.
Airplane crash.
C.
Heavy rain.
D.
Tsunami.
【简答题】Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, winter skating or skiing in winter. It may be a of some kind, football, hockey, golf or tennis. It ...
【单选题】This passage says that the work of removing stones______.
A.
is usually done during the winter
B.
was more difficult before machines were used
C.
must be done again and again
D.
is an interesting job children enjoy doing
【简答题】When did you last see a polar bear? On a trip to a zoo,perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These”Polar Bears” are p...
【简答题】提升旅游者文明行为的途径有哪些?
【单选题】下列四个命题中真命题是（ ）
A.
同垂直于一直线的两条直线互相平行
B.
过空间任一点与两条异面直线都垂直的直线有且只有一条
C.
底面各边相等、侧面都是矩形的四棱柱是正四棱柱
D.
过球面上任意两点的大圆有且只有一个
【简答题】阅读理解。 What's the coolest kind of transportation (交通) for middle school students back from winter holidays? A racing bike? A car? No, it's a special kind of shoes called Heelys (暴走鞋). Heelys look just ...
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