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题型:阅读选择 题类:模拟题 难易度:普通

河北省唐山市路北区2020年九年级英语第二次模拟检测试卷

阅读理解

    Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive (存活) if the rain is spread throughout the year, If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

    Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

    There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay beneath (在……之下) a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing--very, very slowly--as these forces of nature continue to work on the rock.

    Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted (适应) to life in the desert. During the heat of the day a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

(1)、Many plants may survive in deserts when_________.
A、it is dry all the year round B、the rain falls only in a few weeks C、there is little rain in a year D、the rain is spread out in a year
(2)、Sand dunes are formed when____________.
A、sand piles up gradually B、there is plenty of rain in a year C、the sea has dried up over the years D、pieces of rock get smaller
(3)、The underlined sentence in the third paragraph probably means that in a desert there is __________.
A、too much sand B、more sand than before C、nothing except sand D、something else besides sand
(4)、It can be learned from the text that in a desert __________.
A、there is no rainfall throughout the year B、life exists (存在) in rough (恶劣的) conditions C、all sand dunes are a few feet high D、rocks are worn away only by wind and heat
举一反三
阅读理解

As the weather gets warmer,there are few things that are better to do than travel.But traveling might not be that fun for everyone,especially for those who have motion sickness(晕动症).

Motion sickness is also called travel sickness.It is a common experience for many people.Depending on how you travel,it can be called carsickness or seasickness.People with motion sickness feel very uncomfortable while they are in motion.They feel sick and dizzy,like the room around them won't stop spinning.

It is generally believed that motion sickness happens when your senses become confused (困惑的)with each other,Scientific American reported.

We use different parts of our body to sense movement.Our eyes tell us if we are moving.The inner ears (内耳) contain a special liquid that helps us sense our direction and balance.Our muscles react to movement.

When you move around,these body parts work well together.But when you are in a car or an airplane,they get confused.Your inner ear signals that you're moving.This mismatch gives us motion sickness.

But some people are less sensitive to motion sickness.This may be because they have certain genes (基因) that prevent mismatching senses,Bethann Hromatka,told the Atlantic.

Although there are many ways to deal with motion sickness,scientists believe that the key is to simply try to adapt to it.For example,some astronauts do special exercises that give them mild motion sickness.After a week or two,the astronauts become used to it and don't feel uncomfortable anymore,a NASA flight doctor,told the BBC.

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