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【单选题】
在25°C时，将两个铜电极插入一定量的饱和Na 2 SO 4 溶液中进行电解，通电一段时间后在阴极上逸出amol气体，同时析出w克Na 2 SO 4 ?10H 2 O晶体，若保持温度不变，此时剩余溶液的质量分数是（ ）A.
7100 161 %
B.
100w w+36a %
C.
7100w 161(w+18a) %
D.
7100w 161(w+36a) %
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【单选题】A scanner is an ______ device which enables you to feed pictures, photos or documents into a computer system.
A.
ambiguous
B.
ingenious
C.
intrinsic
D.
rigorous
【单选题】A word processor enables you to create a(66)., store it electronically on a disk, display it on a screen, modify it by entering commands and characters from the keyboard, and print it on a printer.
A.
file
B.
document
C.
text
D.
paper
【单选题】Joining a hobby group enables you to meet people with different interests.
A.
Y
B.
N
C.
NG
【单选题】The frictionless maglev train enables you __________. 查看材料
A.
to develop a maglev train rail system
B.
to explain why maglev trains are faster
C.
to pull and push the train forward
D.
to create a magnetic field
E.
to experiment with the maglev train
F.
to travel from Paris to Rome in about two hours
【多选题】Audience analysis enables you to ___________.
A.
select appropriate points of emphasis in your speech
B.
develop a useful level of detail
C.
choose and prepare appropriate visual aids
D.
create a tone that is sensitive to your audience’s circumstances
【单选题】I suppose you are not quite happy in your new position, ______?
A.
do you
B.
don't you
C.
are you
D.
aren't you
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