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【单选题】
—Where can we go into the trade center? —Haven't you seen the sign _____ over there? [ ]A.
B.
C.
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皮皮学刷刷变学霸
举一反三
【单选题】Too much _____________ to dirty air can cause people to suffer from allergies and diseases that will eventually affect people’s hea lth .
A.
experience
B.
exposure
C.
experiment
D.
expertise
【单选题】Stop ______ so much noise! My father is sleeping. [ ]
A.
to make
B.
making
C.
to hear
D.
hearing
【单选题】已知某一差动液压缸的内径D=100mm,活塞杆直径d=70mm,Q=25L/min,p=2Mpa。在(如图所示)情况下可推动的负载w及其运动速度是:
A.
W=7693N，V=0．108m/s
B.
W=6693N，V=0．108m/s
C.
W=7693N，V=0．008m/s
D.
W=5693N，V=0．408m/s
【单选题】— Do you think the MP3 player put its listener ________? — Yes, too much use of it could lead to hearing loss, experts say.
A.
under control
B.
at risk
C.
in use
D.
on top
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