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水管与煤气设施连通时应安装逆止阀。()

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呼吸困难属于中毒煤气中毒。()

The words said by Lukasz Turski in Paragraph 6 suggest that in Poland______.

A. People like him aren"t qualified to do intelligence-related jobs
B. People work in high-tech sector may lose jobs due to financing reduction
C. Scientists of hard science aren"t as looked up to as those of humanities
D. Scientists should be enthusiastic at what their mission

Certain groups oppose stem-cell research because______.

A. it is costly and dangerous
B. it would expand the powers of the government
C. it may spread diseases
D. they oppose the use of aborted fetuses

In Paragraph 5, the author discusses that______.

A. the wage rises over the past 2 decades could be offset by rising production
B. foreign enterprises should switch their manufacturing to cheaper sources
C. if labor costs continue would ripple through the economy
D. average wages grow 19 percent from 2005 to 2010

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