单项选择题

The main purpose of the first 3 paragraphs of the passage is to ______.

A．prove that contaminants are harmful to health
B．show that contaminants could affect the future generations
C．describe some experiments made by toxicologists
D．urge that pesticides should be abandoned
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单项选择题
Which of the following statements is true
A．Without a prospect of a of at the end of investment, no one would ever lend money to anyone involved in bio-medical research.
B．Private fund is the most important financial source for scientific research.
C．It is commonly agreed that people can dispose their own body organs because of their ownership.
D．Commercial use of body organs is unconstitutional in the US.
单项选择题
The main purpose for applying the patent is to ______.
A．to make profit for biotech company
B．to repay the personal debt
C．to make the research possible to last 17 years
D．to make their research legal
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