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【单选题】
关于《比例阀初始工作设定压力为普通制动情况下的压力与紧急制动情况下的压力》说法正确的是A.
之差
B.
之和
C.
中间值
D.
之积
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A.
perspective
B.
prospective
C.
spectator
D.
specialist
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【单选题】Yesterday I________from the Internet that the environmental organization was________on March 15,1986. [ ]
A.
found; found
B.
founded; founded
C.
founded; found
D.
found; founded
【单选题】听力原文：M: I'd like to sign up for the environmental council. I hear it's a great way to get connected in the community. W: It is, but you do put in a lot of hours, so I hope you can provide a bit of fre...
A.
Volunteering is fun.
B.
Volunteering is very difficult.
C.
Volunteering requires a time commitment.
D.
Volunteering requires you to raise money sometimes.
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