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【单选题】
在工程网络计划中,工作N的最迟完成时间为第25天,其持续时间为6天,该工作有两项紧前工作,它们的最早完成时间分别为第10天和第14天,则工作N的总时差为( )天。A.
5
B.
6
C.
9
D.
15
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举一反三
【单选题】Since the recent river pollution in several provinces, people _______ more and more attention to the quality and safety of drinking water.
A.
pay
B.
are paying
C.
have paid
D.
have been paying
【简答题】The more subtle and more serious ______ have been given much less attention.
【单选题】More and more attention has been drawn to the fact that many children are ________ in the countryside when their parents flood into the cities for jobs.
A.
left off
B.
left aside
C.
left out
D.
left behind
【单选题】According to the text, which of the following is true?
A.
It’s always true that teachers’ quality is important.
B.
Salaries in school are higher than those in other industries.
C.
The average quality of the teachers in America is declining.
D.
Administrators have many effective ways to choose best teachers.
【简答题】People ask the Government to pay more attention to______.
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