.

　　A. some websites don't have their own coding

　　B. most of the websites lack protective measures

　　C. Russia is more developed in computer science

　　D. the hackers are equipped with high technology

　　45. What does Paragraph 4 mainly talk about?

　　A. The criminals are fond of using social networks.

　　B. The criminals sell the stolen information for money.

　　C. The stolen information causes great economic losses.

　　D. The stolen information could bring harmful effects.

　　46. What does the underlined sentence in Paragraph 6 imply?

　　A. We cannot tell how large an iceberg is just from the part on the water.

　　B. Many companies are unwilling to report their information stolen.

　　C. Many companies are not aware their information has been stolen.

　　D. People usually can see just a small part of an iceberg.

　　E

　　Planet Earth would be a scary place for humans if dinosaurs still ruled the world. Though

　　there are still some traces of life from the Jurassic Period, the Age of Dinosaurs more than 65 million years ago.

　　This mass extinction is believed to be the result of an asteriod（小行星）hitting Earth. A new

　　report by the journal Biological Reviews called " The Extinction of Dinosaurs” concludes that this impact was, indeed, the cause of the dinosaurs’ demise. But the space blast(爆炸) wasn't the only reason these creatures aren't still around today.

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