单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．The signing is very necessary.
B．The signing is just a reassurance.
C．The signing is not very necessary.
D．The signing is a way to monitor abuse.
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单项选择题
The National Academy of Sciences holds the stance that ______ .
A．DNA testing should be systematized
B．only authorized laboratories can conduct DNA testing
C．the academy only is authorized to work out standards for testing
D．the academy has the right to accredit laboratories for DNA testing
单项选择题
When did hydroelectric power was universally considered as an environmentally safe and clean means of electricity generator
A．Around 250 BC.
B．In 1982.
C．In the middle .years of 20th century.
D．Until only recently.
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