What is the characteristic of Twitters ads？
A. Twitter"s ads are actually hidden among ordinary tweets.
B. Twitter prefers to use big glossy images to attract people"s attention.
C. Twitter"s ads are usually sponsored by big companies like Starbucks
D. After three years" trial, Twitter has decided to change its ads style.
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What information does not provide in the first paragraph？
A. Peru"s sugar industry was very successful in 1960s.
B. Some sugar estates on the country"s north coast used to be government-owned.
C. During the period of government owned, the sugar industry underwent a period of development.
D. There must be revolutions in 1960s.
Which is the possible meaning of the word "counterpart" (Line 9, Para. 4)？
Apart in a high-income country.
B. A person who does the same job.
C. A coworker of the factory laborer.
D. A kind of work which can make money.
压水堆核电厂上充泵在一回路发生()事故或()事故而引起一回路温度、压力下降到一定值时，安注信号发生，又作为高*压安注泵从换料水箱吸取含硼水通过硼注箱向RCP系统冷段注水，或直接注入RCP系统的冷段和热段，防止堆芯烧毁。
A. 中小破口失水主蒸汽管道破裂
B. 大破口失水主蒸汽管道破裂
C. 主蒸汽管道破裂主给水管道破裂
D. 主给水管道破裂大破口失水
What is the main idea of Para. 5？
A. Death rates from burns are higher in some developing countries.
B. European countries have the same death rates with America.
C. Many Asian girls died from the injuries from burns.
D. Reasons why so many Asian girls die from the injuries from bums.
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