Professor Stephen Hawking,who has warned that intelligent aliens probably exist and we should keep a safe distance from them,is among those.“If aliens visit us,the outcome would be much as when Columbus landed in America which didn’t turn out well for the Native Americans,” he said.

　　Signals from Earth’s radio and TV broadcasts have been heading out in space for some 60 years reaching around 5,000 stars.

　　5.Wikipedia is becoming Wookiepedia because 　. 

　　A.we human beings intend to help and save aliens

　　B.scientists wish to explore other planets similar to the earth

　　C.astronomers hope to get in touch with aliens

　　D.aliens might fight against the human race

　　6.What does the underlined word “those” in the fourth paragraph refer to?

　　A.Aliens from space.

　　B.Astronomers sending signals.

　　C.Scientists for the plans.

　　D.Scientists against the plans.

　　7.What has Prof.Stephen Hawking warned?

　　A.Intelligent aliens would probably land in America.

　　B.The plans will be in vain and nothing will happen.

　　C.None of the civilizations would reply.

　　D.Aliens would bring disasters to the human race.

　　8.Which can be the best title?

　　A.Wikipedia,the most popular website

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