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【单选题】
观察在0.3g/mL蔗糖溶液中的洋葱表皮细胞，发现中央液泡逐渐变小，说明 [ ]A.
细胞壁相当半透膜
B.
洋葱表皮细胞是活的
C.
此时蔗糖溶液浓度小于细胞液浓度
D.
细胞壁收缩导致中央液泡失水
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【简答题】4 A.Where matches take place. B.Where protests may take place. C.In downtown Vancouver. D.Around the athletes' village.
【简答题】理想集成运放两输入端 ,输入电流 .
【单选题】Children mustn't play with matches because ______.
A.
matches burn paper
B.
it isn't interesting
C.
they can be dangerous
D.
they can burn a house
【单选题】Paragraph 4 __________ 查看材料
A.
Where do hurricanes usually happen?
B.
What damages can a hurricane cause?
C.
What should you do during a hurricane?
D.
What is a hurricane?
E.
What are different names of hurricanes?
F.
How do you know a hurricane is coming?
【单选题】Children mustn' t play with matches because ______.
A.
matches bum paper
B.
it isn' t interesting
C.
they can be dangerous
D.
they can bum a house
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