单项选择题

"Watchdog" (Line 1, Para 4 ) means ______from the context.

A．a specially trained dog
B．an administrative bureau
C．a technical institute
D．a court
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单项选择题
According to the passage, DuPont______.
A．renamed tacit as to whether exposure to PFOA could be dangerous to the public
B．refused to admit that exposure to PFOA could be a health hazard
C．asked for more evidence to prove that exposure to PFOA could be a threat to people's health
D．condemned the charge that exposure to PFOA could risk people's health
单项选择题
Landed in the spotlight (Line 1, Para 1) can be best replaced by______.
A．"Entered the market"
B．"Retreated from the market"
C．"Become the focus of attention"
D．"Been prohibited from sales"
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