阅读理解

请阅读下面短文，根据短文内容从每小题所给的A、B、C、D四个选项中选出最佳选项。

　　Should we be afraid of sharks? Maybe not．New research into the reasons for shark attacks (攻击) suggests that sharks don't like the way humans taste! In fact, most people who are attacked by the shark are still alive after receiving only one bite (咬)．Why is this?

　　There are many opinions to explain why sharks sometimes attack people．One opinion is that sharks are just curious (好奇的)．We know that sharks are the strongest animals in their environment, so they are not afraid of anything．Naturally, that means they are curious when they meet something unusual．Because they don't have hands or feet．, the only way they can find out an object is to bite it! It is thought that sharks sometimes bite humans for this reason, and then swim away．

　　Scientists also say that sharks would not waste energy trying to eat a human, as we have a lot of bones (骨头)．It is hard for a shark to eat us because sharks don't have hands, and they can't pull the meat off our bones．Maybe that's why they only bite us once．Unluckily, one bite from a large shark is serious enough to hurt people greatly!

　　Another opinion is that sharks attack humans by mistake．Some sharks may sometimes mistake humans for a seal．An example of this is when a shark attack attacks a surfer．A surfer lying on a surfboard looks like a seal when seen from below．Sharks like seals because they have thick fat．

　　Whatever the reason for shark attacks on humans, sharks should be afraid of us．Sadly, we kill almost 40 million of them each year．

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仔细阅读下列短文, 根据题目, 选出最佳选项. It's sometimes reported(报道) that people have seen strange objects(物体)high up in the sky. These unidentified flying objects桿FOs(不明飞行物) have made a lot of people interested. Some of the reports about them are difficult to believe. Scientists have explained some of them, but not all of them. It is not easy to decide whether a report is true or not. One report of UFOs came from a British plane on its way from New York to London in 1954. The British plane was flying over an island at 19,000 feet when the captain(机长)noticed that something was on their left and a little lower than their plane. It's about five miles away. "It was not one object but several," the captain said. "We saw one large and six smaller objects. I sent out a radio to report about them and I received the answer that the other planes were coming out to meet us. Before the planes arrived, the smaller objects entered(进入)the big object. The big object then became smaller and moved away fast. "

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阅读理解

　　People know that some animals，particularly birds，can be trained to carry messages for them．From 3 000 BC to now，pigeons have been used as "postmen" either in war or in peace．

　　In 1870，when the Germans surrounded Paris，the city was cut off from all the usual means of communication．The people tried many different ways to send news．One way was to use pigeons，and the little “postmen” flew fast．In four months about 156 000 letters were sent by them．

　　Now pigeons are still used．This is because sometimes only the little pigeon can carry the message to the place where it is difficult for man to go．That is why pigeons are called“postmen with feathers”．

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