Questions 7 and 8 are based on the following news. In the US, the rise of heroin production in Mexico in 2008 resulted in
A. lower heroin prices.
B. rapid grow of drug trade.
C. more diseases.
D. widespread drug activists.
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Which of the following is NOT the reason for high dropout rate nationally
A. Some students have to earn money to support the family.
B. Some students fail repeatedly in school.
C. Some girls become pregnant.
D. Some students get unfair treatment in school.
Questions 9 and 10 are based on the following news. Which of the following statements about the disease is TRUE
A. It kills 60,000 people in Africa each year.
B. It is easy to diagnose but difficult to cure.
C. It spreads through air.
D. It can cause deat
What is the limitation of standardized tests nowadays
A. There are only essays and demonstrations of knowledge.
B. There are too few multiple-choice questions.
C. They narrow ways of measuring what students have learned,
D. They make it difficult to unify a standard for evaluation.
举例说明DNA结合蛋白对基因转录的影响，另简述鉴别DNA结合蛋白在DNA分子上结合位点的两种常用方法。
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