单项选择题

The research findings______.

A．have severely influenced the company's reputation
B．have made the company suffer a loss of profits
C．have done nothing serious to the company
D．have led the company to improve its products

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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

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