2021年职称英语考试《卫生类》考试共65题，分为单选题和多选题和判断题和计算题和简答题和不定项。小编每天为您准备了5道每日一练题目（附答案解析），一步一步陪你备考，每一次练习的成功，都会淋漓尽致的反映在分数上。一起加油前行。

1、Blasts from the Past 1 Volcanoes were more destructive in ancient history. Not because they were bigger, but because the carbon they released wiped out life with greater ease. 2 Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions ａｎｄ　mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300. million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do. 3 Wignall calculated the "killing efficiency" fｏｒthese volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size fｏｒsize, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals. 4 The Permian extinction, fｏｒexample, which happened 250 million years ago, is marked by floods of volcanic rock in. Siberia that cover an area roughly the size of western Europe, Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide, The global warming that followed wiped out 8 per cent of all marine genera at the time, ａｎｄ　it took 5 million years far tire planet to recover. 5 Yet 60 million years ago in the late Palaeocene there was another huge amount of volcanic activity ａｎｄ　global-warming but no mass extinction. Some animals did disappear but things returned to normal within ten thousands of years, "The most recent ones hardly have an effect at all," Wignall says. He ignored the extinction which wiped out the dinosaurs at the end of the Cretaceous, 65 million years ago, because many scientists believe it was primarily caused by the impact of an asteroid. 6 Wignall thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of C02 Ocean chemistry may also have played a role. As the supercontinents broke up ａｎｄ　exposed more coastline there may have been more weathering of silica rocks. This would have encouraged the growth of phytoplankton in the oceans, increasing the amount of C02 absorbed from the atmosphere. 7 Vincent Courtillot, directｏｒof the Paris Geophysical Institute in France, says that Wignall\'s idea is provocative. But he says it is incredibly hard to do these sorts of calculations. He points out that the killing power of volcanic eruptions depends on how long they fasted. ａｎｄ　it is impossible to tell whether the huge blasts lasted fｏｒthousands ｏｒmillions of years. 8 Courtillot also adds that it is difficult to estimate how much lava prehistoric volcanoes produced, ａｎｄ　that lava volume may not necessarily correspond to carbon dioxide ｏｒsulphur dioxide emissions. Paragraph 3____ 【单选题】

A.Killing Power of Ancient Volcanic Eruptions

B.Association of Mass Extinction with Volcanic Eruption

C.Calculation of the Killing Power of Older Eruptions

D.A Mass Extinction

E.Volcanic Eruptions That Caused No Mass Extinction

F.ccounting fｏｒthe Killing Power of Older Eruptions

正确答案:C

答案解析:第三段的第一句话是这么说的：Wignall calculated the“killing efficiency”fｏｒthese valcanoes wignall计算了这些火山的“灭种效率”。killing power与killing efficiency意思差不多。killing power：灭种力。

2、Shy felt frustrated when nobody understood what she was trying to say. 【单选题】

A.boring

B.upset

C.angry

D.dull

正确答案:B

答案解析:frustrated和upset意思相同，表示“失心烦意乱的、闷闷不乐的”；boring：令人厌烦的；angry：生气的、恼怒的；dull：没有意思的、乏味的。

3、The polar lights, one of the most unusual phenomena in nature, is beautiful to behold. 【单选题】

A.view

B.relate

C.sketch

D.withhold

正确答案:A

答案解析:behold：看，和view（观察、观看）词义相近；relate：叙述、讲；sketch:素描、勾画；withhold:保留、抑制。

4、Surprised by a MiracleI had been working in the trauma unit at a local hospital fｏｒabout a year. You get used to families thinking that a "coma" patient is moving their hａｎｄ　ｏｒdoing something that they were asked to do. "Following commands" is what we call it. Often it\'s "wishful thinking" on the Families\' part. Nurses can easily become callous to it.On this particular night during visiting hours, my patient\'s wife came in. I had taken care of him fｏｒseveral nights. I was very familiar with his care ａｎｄ　what he was able to do. Actually, he didn\'t do anything. He barely moved at all, even when something would obviously hurt him, such as suctioning.His wife was very short, about 5 feet tall. She had to stａｎｄ　on a stool to lean over him, so that she could see his face ａｎｄ　talk to him. She climbed up on the stool. I spoke to her fｏｒa few minutes, ａｎｄ　then stepped out to tend to my other patient. A few minutes later, she came running out of the room. In an excited voice, she said, "Donna, he\'s moving his hand!"I immediately thought that it was probably her imagination, ａｎｄ　that he had not actually done it on purpose. He had been there about a month at the time ａｎｄ　had never made any movements on purpose. I asked her what had happened ａｎｄ　she said, "I asked him to squeeze my hａｎｄ　ａｎｄ　he did!"This led me to another train of questioning. "But, did he let go when you asked him to?" She said yes, that he had done exactly what she asked.I went into the room with her, not really believing that I would see anything different than I had always seen. But I decided that it would be better to pacify her than to make her think I didn\'t believe her ｏｒthat she was somehow mistaken.She asked him to squeeze her hand, which he did. I said, "Well, ask him to let go. " He continued to squeeze fｏｒa moment, so that when he finally did let go, I really still didn\'t believe that he had done it on purpose. So, I said, "Ask him to hold up one finger. " He did as asked.Well, hmm, this was starting to get my attention. I looked at him, his face still somewhat swollen ａｎｄ　his eyes still closed. "Stick out your tongue!" I said. He did it. I almost fell on the floor. It was the first time I had ever seen anyone "wake up. "How did the authｏｒfeel upon first hearing what the excited wife said?【单选题】

A.She was amused.

B.She was doubtful.

C.She was scared.

D.She was shocked.

正确答案:B

答案解析:短文的第三段的头一句话表明，作者开始基本上不相信病人家属所说的话。

5、Smallpox virusIt\'s now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it—one in the US ａｎｄ　one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves?In reality, of course, it was naive to imagine that everyone would let go of such a potential weapon. Undoubtedly several nations still have a few vials. ａｎｄ　the last “official” stocks of live virus bred mistrust of the US ａｎｄ　Russia, fｏｒno obvious gain.Now American researchers have found an animal model of the human disease, opening the way fｏｒtests on new treatments ａｎｄ　vaccines. So one again there\'s a good reason to keep the virus—just in case the disease puts in a reappearance.How do we ____ with the mistrust of the US ａｎｄ　Russia? Simple. Keep the virus under international auspices in a well-guarded UN laboratory that\'s open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn\'t mean the idea is wrong. If the virus is useful, then let\'s make it the servant of all humanity—not just a part of it.【单选题】

A.handle

B.tackle

C.deal

D.treat

正确答案:C

答案解析:此题考查固定搭配。deal?with:处理。故C为正确答案。