MS affects the communication of nerve cells between the body and____________
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Drinking three cups of coffee a day____________
A. may not be recommended by most doctors
B. is harmful to healthy people
C. will probably not cause problems
D. may benefit sensitive people
Apart from modernizing Bhutan, what else did Wangehuek want to do for Bhutan？
A. To make its population grow.
B. To keep it separate from the world.
C. To encourage its people to get rich.
D. To keep its tradition and customs.
The walls are made of hollow concrete block .
A. big
B. empty
C. long
D. new
大量的氢原子从基态被激发到n=3的能量状态，当这些氢原子向低能态跃迁时，能够观测到的谱线的条数为（）
A. 1
B. 2
C. 3
D. 4
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