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手持望远镜，由于考虑到望远镜视场抖动影响，通常设计到10倍以下较为合理
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Read the following paragraph carefully and cross out the sentence which breaks unity.①The rapid increase in crime in Chicago is causing a great deal of concern to the city’s citizens. ②People are afraid to go out into the streets at night because they are afraid of being robbed or even killed. ③More and more families are moving out of the city into the suburbs because of the high crime rate. ④The chief of police was fired last month because of his inability to reduce crime. ⑤People are buying strong locks for their doors and installing heavy iron bars across their windows to prevent burglaries. ⑥Some citizens are even purchasing guns to protect themselves and their property. ⑦Indeed, it seems that the increase in crime is turning the average home in Chicago into a prison for its inhabitants.
Read the following paragraph carefully and cross out the sentence which breaks unity.①The beaver has four gnawing incisors, two uppers and two lowers, that are rather ingeniously adapted to woodcutting. ②They grow constantly and wear with use to a chisel edge. ③The back side of the tooth, because it is made of a soft dentine, wears down, whereas the front side, outer-layered as it is with a very strong orange-colored enamel, doesn’t. ④The beaver has lips that can close behind the incisors to keep the mouth free of wood chips and, when the beaver is gnawing underwater, water. ⑤The beaver is the largest rodent in North America.
Read the following paragraph carefully and cross out the sentence which breaks unity.①There are many types of pets in an average household. ②People will often even choose pets according to their personalities. ③Some people like small dogs that are easy to take care of and do not demand a lot of attention. ④Some owners prefer strong or vicious dogs, like bulldogs for example. ⑤Other people might like cats because they are independent and really need no attention at all. ⑥Birds provide people with a lot of company, if you like bird songs, but their cages need a lot of cleaning. ⑦A fish tank is great to look at but the tanks must be cleaned often as well. ⑧Some people even treat their plants like pets and talk to them. ⑨In a zoo, large animals, like polar bears, are left to themselves in their cages.
Read the following paragraph carefully and cross out the sentence which breaks unity.①Each of the Russian manned space exploration projects had specific major goals. ②For example, the Vostok project was designed to test whether or not human beings could survive and function in outer space. ③For another example, the Voshkhod project was intended to find out whether people could work in the weightless environment of space. ④One Voshkhod cosmonaut experimented with weightlessness by taking a "spacewalk." ⑤That is, he floated in a spacesuit outside his Voshkhod spacecraft, connected to it by a tether. ⑥The cosmonaut to do this was Alexei Leonov. ⑦Several weeks later, Leonov's spacewalk was followed by that of U.S. astronaut Ed White. ⑧Finally, the Soyuz project, with three cosmonauts, had goals of testing spacecraft and spaceflight skills so that people could fly long missions in Earth orbit.
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