北师大版英语高二下册unit22environmentalprotection同步测试

北师大版英语高二下册unit22environmentalprotection同步测试内容摘要：

er is important C. describe the terrible scene that is caused by the natural disasters D. give advice on how to deal with the management of environmental health 61. In order to effectively cope with the emergency, the most important is that _____. A. we should have enough shelters and tools B. everyone should be familiar with the situation C. we should be well prepared for it in advance D. we can deal with it just as we did before 62. We can’t do just as the remended environmental health measures because _____. A. some of the measures have not been taken before B. they are not the same according to different degrees or types of emergency C. they are probably made up by someone without experience D. they can’t be changed once they are taken by the experts 63. The best title of this passage should be _____. A. Environmental Health Management after Natural Disasters B. The Bad Influence of the Natural Disasters C. Useful Measures to Avoid the Natural Disasters D. The Importance of the Environmental Health Management C Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour. The gene es in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science. Scientists have changed the colour of a darkstriped zebrafish to uniform gold by inserting a version of the pigment(色素 ) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素 ). The number, size and darkness of melanosomes per pigment cell determines skin colour. It appears that, like the golden zebrafish, lightskinned Europeans also have a mutation(变异 ) in the gene for melanosome production. This results in less pigmented skin. However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes. Humans acquired dark skin in Africa about million years ago to protect bodies from ultraviolet rays of the sun(太阳光紫外线 ), which can cause skin cancer. But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng. Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng. The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson. 64. The passage mainly tells us that ________. A. people can not change their skin colour without any pain B. the new discovery could lead to search into ways to change skin colour safely C. pop king Michael Jackson often changed his skin colour as he liked D. scientists have found out that people’s skin colour is determined by the gene 65. It can be inferred from the passage that ________. A. nowadays people who want to change their skin colour have to suffer a lot from the damage caused by the chemical treatment B. Europeans and Africans have the same gene C. the new discovery could help to find medical treatments for skin cancer D. there are two kinds of genes 66. Scientists have done an experiment on a darkstriped zebra fish in order to ________. A. find the different genes of humans’ B. prove the humans’ skin colour is determined by the pigment gene C. find out the reason why the Africans’ skin colour is dark D. find out the ways of changing peopl’s skin colour 67. The reason why Europeans are lightskinned is probably that ________. A. they are born lightskinned people B. lightskinned Europeans have mutation in the gen for melanosome production C. they have fewer activities outside D. they pay much attention to protecting their skin D Animals are being killed by hunters in America in a cruel way, says an animal protection anization. There are about 1,000 hunting farms across America whose owners offer hunters an opportunity to kill animals that are kept in fenced areas. Russian boar, zebra, deer, antelope and many other species are raised just to be killed. Farm owners charge hunters thousands of dollars for animals that they kill, many of which are close to extinction (灭绝 ). The Humane Society of the United States says this type of hunting should be stopped because it is not fair to the animals. Many owners raise their animals. Others buy from animal dealers or from zoos and circuses that no longer want them. This means that the animals are not afraid of humans and they are easy to be shot by hunters. Owners of small ranches (牧场 ) keep their animals in fenced areas so that the hunters can get close to the animals before shooting at them. On large farms hunters are taken to areas where the animals are fed sometime of the day. This also makes it easy to kill the animals. The hunters want to keep the heads and chests of the animals they kill to hang as trophies (战利品 ) on their walls. This means that the animals are usually shot in parts of the body. That means they will suffer a slow and painful death. The hunting is allowed ac。