2020-2021学年高中英语 课时作业（八）Unit 2 Cloning Section Ⅳ Grammar-—同位语及同位语从句（含解析）新人教版选修8.doc

1、课时作业(八)Unit 2Section Grammar同位语及同位语从句.单句语法填空1The suggestion _ we should learn something practical is worth considering.2Word comes _ he has been elected monitor of our class.3The manager put forward a suggestion _ we should have an assistant. There is too much work to do.4The message _ the plane wil

2、l take off on time makes everybody happy.5The fact _ he had not said anything surprised everybody.6The fact has worried many scientists _ the earth is becoming warmer and warmer these years.7Students should involve themselves in community activities _ they can gain experience for growth.8The news _

3、he has been elected president of the organization is true.9The truth _ heavy objects and light objects fall at the same speed is known to all.10There is a strong possibility _ man will mainly depend on solar energy in the future.阅读理解By the end of the century, if not sooner, the worlds oceans will be

4、 bluer and greener thanks to a warming climate, according to a new study.At the heart of the phenomenon lie tiny marine microorganisms (海洋微生物) called phytoplankton. Because of the way light reflects off the organisms, these phytoplankton create colourful patterns at the ocean surface. Ocean colour v

5、aries from green to blue, depending on the type and concentration of phytoplankton. Climate change will fuel the growth of phytoplankton in some areas, while reducing it in other spots, leading to changes in the oceans appearance.Phytoplankton live at the ocean surface, where they pull carbon dioxid

6、e (二氧化碳) into the ocean while giving off oxygen. When these organisms die, they bury carbon in the deep ocean, an important process that helps to regulate the global climate. But phytoplankton are vulnerable to the oceans warming trend. Warming changes key characteristics of the ocean and can affect

7、 phytoplankton growth, since they need not only sunlight and carbon dioxide to grow, but also nutrients.Stephanie Dutkiewicz, a scientist in MITs Center for Global Change Science, built a climate model that projects changes to the oceans throughout the century. In a world that warms up by 3 ， it fou

8、nd that multiple changes to the colour of the oceans would occur. The model projects that currently blue areas with little phytoplankton could become even bluer. But in some waters, such as those of the Arctic, a warming will make conditions riper for phytoplankton, and these areas will turn greener

9、. “Not only are the quantities of phytoplankton in the ocean changing，” she said, “but the type of phytoplankton is changing.”And why does that matter? Phytoplankton are the base of the food web. If certain kinds begin to disappear from the ocean, Dutkiewicz said, “it will change the type of fish th

10、at will be able to survive.” Those kinds of changes could affect the food chain.Whatever colour changes the ocean experiences in the coming decades will probably be too gradual and unnoticeable, but they could mean significant changes. “Itll be a while before we can statistically show that the chang

11、es are happening because of climate change，” Dutkiewicz said, “but the change in the colour of the ocean will be one of the early warning signals that we really have changed our planet.”1What are the first two paragraphs mainly about?AThe various patterns at the ocean surface.BThe cause of the chang

12、es in ocean colour.CThe way light reflects off marine organisms.DThe efforts to fuel the growth of phytoplankton.2What does the underlined word“vulnerable”in Paragraph 3 probably mean?ASensitive. BBeneficial.CSignificant. DUnnoticeable.3What can we learn from the passage?APhytoplankton play a declin

13、ing role in the marine ecosystem.BDutkiewiczs model aims to project phytoplankton changes.CPhytoplankton have been used to control global climate.DOceans with more phytoplankton may appear greener.4What is the main purpose of the passage?ATo assess the consequences of ocean colour changes.BTo analys

14、e the composition of the ocean food chain.CTo explain the effects of climate change on oceans.DTo introduce a new method to study phytoplankton.课时作业(八).单句语法填空1that2.that3.that4.that5.that6.that7.where8.that9that10.that.阅读理解【语篇解读】本文是一篇说明文。调查表明，由于气候变暖，全球的海洋将会变得更蓝、更绿。1答案与解析：B段落大意题。文章第一段点题：由于气候变暖，全球的海洋将

15、会变得更蓝、更绿。第二段介绍由于光从生物体反射的方式，这些浮游植物在海洋表面形成了五颜六色的图案；气候变化又使得这些浮游植物在某些区域加速生长而在其他地方有所减少，导致海洋表面的颜色变化。由此可知前两段讲了海洋颜色变化的原因，故B项正确。2答案与解析：A词义猜测题。后一句提到，气候变暖改变了海洋的主要特点并能影响浮游植物的生长，因为它们要生长不仅仅需要阳光和二氧化碳，也需要营养。由此可知，这些浮游植物对海洋变暖很敏感，故A项正确。3答案与解析：D推理判断题。文章倒数第二段提到这些浮游植物是海洋食物链的基础，如果某些种类的浮游植物消失了，会影响能存活的鱼的类型，从而影响海洋食物链，所以A项“浮游

16、植物在海洋生态中所起的作用越来越小。”是不对的；Dutkiewicz的模型不是用来推断浮游植物的变化的，而是推断海洋的变化的，排除B项；浮游植物不是用来控制全球气候的，排除C项。由文章第四段信息“But in some waters，such as those of the Arctic，a warming will make conditions riper for phytoplankton，and these areas will turn greener.”可知浮游植物多的区域海水会变得更绿，故D项正确。4答案与解析：C主旨大意题。文章主要论述了随着气候变暖，全球的海洋将会变得更蓝、更绿，即气候变化对海洋有影响，故C项正确。