阅读理解

　　First it was an earthquake．Then came a terrible tsunami．These natural disasters killed thousands of people in Japan on Mar．11, 2011．Then a nuclear crisis(核危机)put the island in danger and shocked the world．

　　Damaged by the earthquake and tsunami, Fukushima Daiichi nuclear plant(福岛第一核电站)has put out dangerous radioactive(放射性的)materials．Experts from several countries are working to control the crisis．

　　Although the reports say the leak so far will not cause huge health problems, people are worrying about nuclear safety．Switzerland has stopped plans to build new nuclear plants．Germany raised questions about its nuclear future．

　　As for China, the government has suspended approving(暂停审批)new nuclear power stations and stepped up safety checks at existing plants, Xinhua reported．But it is reported that all nuclear power stations in China are safe．

　　A nuclear power plant creates electricity．It is a clean energy source．In 1954, the world's first nuclear power plant was built in Russia．From then on, nuclear power has been widely used．

　　But nuclear power plants have hidden problems．If radioactive materials get into the air or water, they can pollute soil and plants and harm humans and animals．Nuclear accidents, such as the Chernobyl(切尔诺贝利)disaster in 1986 in the Ukraine, have caused great damage to the nearby people and the environment．

　　Will there be another choice for energy that we can use in the future? In recent years, scientists have found ways to make electricity from sunshine, wind and garbage．

　　Some scientists say hydrogen(氢气)may be used to create power．Hydrogen is a clean resource to use, and will never disappear．Some car companies have already developed cars powered by hydrogen．But still, the technology for its production is only in early stages of development．

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根据短文内容选择最佳答案。

　　Long before human beings came to this world, dinosaurs were once kings on the earth．They were either meat-eaters or plant-eaters．Recently scientists found the longest dinosaur fossil in the world in Xinjiang．It is a 15-metre-long neck bone．Scientists think the bone is a part of a 35-metre-long Mamenxi Dinosaur．

　　Mamenxi Dinosaurs lived from 156 million to 145 million years ago．They had the longest neck of any known dinosaur．They ate plants．They used their 10-metre-long neck to reach high leaves．

　　Mamenxi Dinosaurs may have hatched from eggs．Scientists think the mothers laid their eggs as they walked．But they probably did not take care of their babies．If the babies survived, they lived for about 100 years．

　　T-rex lived about 85 million to 65 million years ago．Scientists found their fossil in tropical forests near rivers．This meat-eater had a huge head．It has tiny arms, each with two fingers．T-rex had a slim, hard, pointed tail．It helped them to balanced and make quick turns while running．

　　Not all dinosaurs were huge．There were plenty of small and medium-sized dinosaurs．The smallest dinosaur discovered was the size of a chicken．

　　There were no flying dinosaurs or swimming dinosaurs．All dinosaurs lived on the land．None of them lived in the sea or flew(before birds)．There were some flying and swimming animals then but they were closely related to dinosaurs．Some meat-eating dinosaurs developed feathers and became birds．

　　Dinosaurs lived on the earth for more than 150 million years, and then disappeared about 65 million years ago．Scientists try to explain their disappearance, but they've got more questions than answers．Dinosaurs are mysterious．Perhaps this is why people love them so much．

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