In writing the text, the author tries to _____.
A. urge people to say no to smart appliances
B. compare the advantages and disadvantages (缺点) of smart appliances
C. suggest some more useful features to the manufactures
D. urge the manufacturers to produce better smart appliances
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She completely lost her voice and had to give _____ teaching.
A. to
B. up
C. on
D. down
Even the mechanic couldn’t figure ______ what had gone wrong with the car.
A. away
B. off
C. on
D. out
This course will be taught through the computers connected ____ the Internet.
A. for
B. to
C. in
D. with
We don’t need a dishwasher that we can communicate with from the office.
A. 我们不需要能在办公室里与之交流的洗碗机。
B. 我们需要能在办公室里与之交流的洗碗机。
C. 我们不需要一个洗碗机去和办公室交流。