某工程双代号网络图如图所示，其关键线路有()。
A. 2条
B. 1条
C. 3条
D. 4条
Regarding pesticides, the author thinks that ______.
A. their danger has been exaggerated
B. Their effects have been proved by EPA
C. they are not effective for killing some pests
D. they may cause some illnesses in children
The word "Celebrex" in the advertisement ______.
A. misleads people into buying dangerous drugs
B. reminds people of a cheerful feeling
C. boasts of the effectiveness of a drug
D. comes from a religious term
The author mentioned "Starbucks" in Para. 3 as an illustration of ______.
A. happiness
B. low life expectancy
C. perpetual stress
D. luxury
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