皮皮学，免费搜题
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搜题
【单选题】
According to the passage, "electronic mail" is a way to _________.A.
upgrade the old mail system
B.
get electronics by mail
C.
communicate by personal computers or computer terminals
D.
connect to the post office
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皮皮学刷刷变学霸
举一反三
【单选题】How to determine the density of the slop after tank washing?
A.
Using an interferometer.
B.
Using a hydrometer.
C.
Using an interface.
D.
Using a thermometer.
【单选题】The ball ____ two or three times before rolling down the slop
A.
swayed
B.
bounced
C.
hopped
D.
darted