B. It is very important.

　　C. It ended up as a failure.

　　D. It is not smooth.

　　2. How long will Curiosity stay on Mars traveling through the crater?

　　A. About one year.

　　B. About two years.

　　C. About four years.

　　D. About five years.

　　3. Curiosity is mainly designed to ______.

　　A. search for life evidence on Mars

　　B. prepare for human landing on Mars

　　C. explore the natural resources on Mars

　　D. try out some scientific instruments

　　4. We can infer that Ray Bradbury ______.

　　A. designed the Mars rover Curiosity

　　B. is a space scientist from NASA

　　C. has just died

　　D. is an English science­fiction writer

　　5. What is Mr. Theisinger's attitude towards the mission?

　　A. Very optimistic.

　　B. Very confident.

　　C. Very disappointed.

　　D. Very cautious.

　　Ⅳ.阅读填空(每空不超过三个单词)

　　Drones are used extensively by the military. There are killer drones, attack drones, spy drones and surveillance(监视) drones used in the military. At present, the USA has some 7,000 military drones in military operation. It is predicted that by 2020, there could be as many as 30,000 in the US army. But is this a good thing?

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