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1、阅读理解。阅读下列短文, 从给的四个选项 (A、B、C 和 D) 中, 选出最佳选项。US researchers have found traces of an ancient lake on Mars recently，increasing hopes of discovering evidence that billions of years ago the Red planet hosted life.The lake，which dates back some 3.4 billion years，appears to have covered as much as 80 square
2、 miles and was up to 1,500 feet deep，said the team from the University of Colorado.“This is the first clear evidence of shorelines on the surface of Mars， ”said Boulder s research associate，Gaetano Di Achille，in a study published in the latest edition of Geophysical Rese arch Letters.“The identifica
3、tion of the shorelines and accompanying geological evidence allows us to calculate the size and volume of the lake，which appears to have formed about 3.4 billion years ago.”Analysis of the images has shown the water carved out the canyon(溪谷)in which it was found，which then opened out into a valley d
4、epositing(使淤积)sediment(沉积)which formed a delta(三角洲)“Finding shorelines is a great discovery to us， ”said assistant professor Brian Hynek，adding it showed the lake existed at a time when Mars was thought to have been cold and dry.Scientists believe the oldest surfaces on Mars formed during the wet an
5、d warm era known as the Noachan epoch，about 4.1 billion to 3.7 billion years ago.The newly discovered lake is believed to date from the Hesperian era and postdates the end of the warm and wet period on Mars by 300 million years，according to the study.Scientists believe deltas next to the lake may we
6、ll hold secrets about past life on Mars as such places on Earth have become the natural deposits of organic carbon and other markers of life.1. The size of the lake found on Mars is_.A80 square milesB1,500 square milesC3.4 billion square milesD300 million square miles答案：A 细节理解题。根据第二段中“The lake，which
7、 dates back some 3.4 billion years，appears to have covered as much as 80 square miles”一句，可推知答案。2. When the lake existed，the weather on Mars was _.Ahot and wet Bwet and warmCcold and dry Dcold and wet答案：C 细节理解题。根据第六段中it showed the lake existed at a time when Mars was thought to have been cold and dry
8、 知，答案为 C。 3. Why do scientists think deltas near the lake may hold secrets about past life on Mars?A. Because similar places on Earth have become natural deposits of markers of life.BBecause someone has put secrets about past life on Mars there. CBecause past life has been found in other deltas on M
9、ars. DBecause some people are said to have already seen life marks there.答案：A 细节理解题。由原文最后一句可直接找到答案。4. Which of the following statements is NOT true according to the passage? AThe Noachan epoch was a wet and warm era.BThe lake might have existed 3 .4 billion years.CThe discovery can t fully prove tha
10、t the Mars once hosted life.DThe lake traces prove that there exists life on Mars now.答案：D 推理判断题。由第一段内容可知火星上湖岸线的发现只是增加了人们发现亿万年前火星上曾经存在生命证据的可能性，但并不能推出火星上现在有生命。阅读下列短文，从每题所给的四个选项（A、B、C 和 D）中，选出最佳选项。BEIJING - Chinas National Tourism Administration (NTA) said Saturday that 215 Chinese tour groups in Japa
11、n were safe and sound after a devastating 8.8-magnitude earthquake jolted the countrys eastern coast Friday.A total of 4,578 Chinese tourists were staying in Japan at the time of the quake. By Saturday noon, all the 215 tour groups that they booked with had contacted domestic travel agencies, with n
12、o death or injury reported, said the NTA upon information from local tourism authorities.The NTA has activated the emergency response system and issued a travel alert for Japan and countries along the Pacific Rim, it said in a statement on its website.The NTA has also called for travel agencies to p
13、rotect the security of Chinese tourists in Japan and keep in touch with the Chinese embassy and consulates in Japan, as well as Chinas tourism authorities.Chinese tour agencies had started to bring back tourists from the quake-hit Japan and many trips had been called off.China CYTS Tours, one of Chi
14、nas major travel agencies, had promised a full refund for trip cancellation and offered to bear the extra expense for tourist protection in disasters and unrest.A massive 8.8-magnitude earthquake struck the east coast of Japans main Honshu Island at 1:46 pm Beijing Time Friday, which had triggered h
15、uge tsunami along Japans Pacific coast and caused hundreds of deaths and catastrophic damage.1. Where are we likely to find this passage?AIn a tour guided book BIn a geography bookCIn a book DIn a newspaper2. In the first paragraph，the meaning of devastating is .Acatastrophic Bdestructive Ctragic Dd
16、isastrous3. Which of the following is TRUE according to the passage?AIn all, 4,578 Chinese were staying in Japan at the time of the quake.BJapan also called for travel agencies to protect the security of Chinese tourists.C215 Chinese tour groups in Japan were organized by China CYTS Tours.DEarthquake-caused tsunami resulted in hundreds of deaths and disastrous damage.【参考答案】13、DBD 完形填空。阅读下面短文，掌握其
