C. clearmg wrongly accused people
D. telling twins apart
69. DNA samples are not popular with all the people because _______ .
A. the government in Britain establishes a criminal database
B. the US and Canada develop similar systems
C. DNA samples can be used to harm a person’s privacy
D. DNA testing is too expensive and dangerous now
70. Where will you most probably find this article?
A. In a guidebook.
B. In a storybook.
C. In a science fiction.
D. In a scientific magazine.
71. Which is the best title for the passage?
A. Discovery of DNA testing by Jeffery
B. Practice of DNA testing in court
C. DNA testing in the present situation D.Benefits and side effects of DNA testing
E
On a one-acre site alongside many shrimp boats stands a $2.2 million assembly(组合体) of pipes, sheds , and humming machinery — a plant in Texas to make sea water suitable to drink.
The plant is an experimental project built as the former of the state’s $150 million, full-scale sea water desalination (脱盐)plant planned for construction in 2010.
Desalting sea water is expensive, mostly because of the energy required. The cost runs at about $650 per acre-foot, but it only costs $200 to purify(净化) the same amount of fresh water.
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