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【单选题】
如果有一个分数m/n，则我们可以保证误差低于（）。A.
1/n
B.
1/2n
C.
（m-n）/2n
D.
（m+n）/2n
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举一反三
【单选题】According to the leaflet, better public transportation is very effective in reducing pollution because ______.
A.
the city will have more money to deal with pollution problems
B.
fewer people will drive their own cars
C.
there will be more places for trees and grass
D.
buses and trains do not produce dangerous gas
【单选题】The advantage(s) of effective public speaking is/are:（）
A.
Generating an understanding of your message.
B.
All of the answers are correct.
C.
Impacting and persuading your audience.
D.
Motivating your audience to take a certain action.
【单选题】What is the author's view on personality?
A.
Personality is the key to success in public speaking.
B.
Extroverts are better public speakers.
C.
Introverts have to learn harder to be good speakers.
D.
Factors other than personality ensure better performance.
【简答题】Beijing has an extensive public transportation network. Subway and City Rail with high speed trains running at intervals of 3 to 5 minutes are the fastest public transportation in the city. There are ...
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