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【单选题】
在人体所需的十多种微量元素中,有一种称为生命元素的R元素,对延长人类的寿命起着重要的作用。已知R元素的原子有四个电子层,其最高价氧化物的分子式为RO3,则R元素的名称为A.
硫
B.
砷
C.
硒
D.
硅
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【单选题】From the passage it can be seen that a 'friend' can be ______.
A.
a fellow worker
B.
a football teammate
C.
a boy or a girl
D.
all of the above
【单选题】These pollutants can be ______ hundreds and eve thousands of kilometers by large air masses.
A.
contained
B.
conveyed
C.
contaminated
D.
conserved
【单选题】使用 G28 指令时,( )
A.
（ A ） 必须先取消刀具半径补偿
B.
（ B ） 必须先取消刀具长度补偿
C.
（ C ） 半径补偿和长度补偿都必须取消
D.
（ D ） 两者都不必要
【单选题】听力原文：W: Have you seen Tom lately? M: Yeah. He is really something nowadays. I can’t even get close to him. Q: What does the man think about Tom? (17)
A.
Tom is very rich now.
B.
Tom is a very important person.
C.
Tom has become very bad guy.
D.
Tom is arrogant to his old friends.
【单选题】There is no possibility, ________ can be seen at the moment, ________ we can win the game.
A.
which; when
B.
where; that
C.
that; which
D.
which; that
【简答题】It can be seen that the number of ions can be affected by____________.
【单选题】He was last seen in public on the ______ of his daughter's wedding.
A.
chance
B.
occasion
C.
event
D.
affair
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