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Unit 6 Welcome to the unit 同步练习
基础巩固
一、词汇运用
A. 根据句意及首字母提示完成单词。
1. The m______ are very high and dangerous.
2. The forest is a beautiful and peaceful p______.
3. Oceans c______ a large area of the earth.
4. The d______ is very dry and there is little water.
5. The plain is very f______ and you can see far away.
B. 用所给单词的适当形式填空。
1. Two thirds of the earth's surface ______ (be) covered by water.
2. The Yangtze River is one of the longest ______ (river) in the world.
3. Forests help to keep the air ______ (clean).
4. It's very cold in the desert at ______ (night).
5. These mountains are usually ______ (cover) with snow.
二、单项选择
1. —______ do you know about deserts
—They are very dry and hot.
A. What B. How C. Where D. When
2. The river ______ from the mountains and runs into the sea.
A. rises B. raises C. gets D. goes
3. —Which landscape do you like best
—I like ______ best.
A. mountains B. deserts C. plains D. forests
4. Oceans cover about ______ of the earth's surface.
A. three fourths B. three quarter C. three quarters D. third four
5. —How long is the Yangtze River
—It's about 6,300 kilometres ______.
A. wide B. deep C. long D. high
能力提升
三、句型转换
1. Forests help make the air clean. (改为同义句)
Forests help ______ the air ______.
2. Deserts are often hot during the day but cold at night. (对划线部分提问)
______ ______ deserts often like during the day and at night
3. Rivers carry water from high ground down to lakes or the sea. (对划线部分提问)
______ ______ rivers carry water
4. Mountains are high and they are usually covered with rocks and snow. (改为一般疑问句)
______ mountains high and ______ they usually covered with rocks and snow
5. Plains are open and flat. They cover over one third of the world's land area. (合并为一句)
_______________________________________________________________________
拓展延伸
四、阅读理解
A
There are many different landscapes in the world. Mountains are one of them. They are very high and beautiful. Some mountains have snow on the top all year round.
Oceans are very large. They cover more than two-thirds of the earth's surface. The water in the oceans is salty. There are many kinds of fish and other living things in the oceans.
Deserts are very dry. There is little rain in deserts. It is very hot during the day and very cold at night.
Forests are full of trees and other plants. They help to make the air clean and fresh.
Rivers carry water from high places to low places. Some rivers are very long, like the Yangtze River and the Amazon River.
Plains are large areas of flat land. They are often used for farming.
根据短文内容，判断下列句子正（T）误（F）。
( ) 1. Mountains are not beautiful.
( ) 2. Oceans cover less than half of the earth's surface.
( ) 3. It is very cold in deserts at night.
( ) 4. Forests can make the air clean.
( ) 5. Plains are not good for farming.
B
Different landscapes have different features. Mountains are usually high and have rocks and snow. Some people like climbing mountains because it's a great challenge.
Oceans are huge and deep. There are many beautiful corals and fish in the oceans. But we should protect the oceans because there is a lot of pollution now.
Deserts are dry and hot. It's very difficult to live in deserts. But some plants and animals can still survive there.
Forests are home to many animals and plants. We should not cut down too many trees in the forests.
Rivers are important for us. We can get water from rivers. But some rivers are polluted, too.
Plains are wide and flat. Many people live on plains and grow crops there.
根据短文内容，回答下列问题。
1. Why do some people like climbing mountains
2. What should we do to protect the oceans
3. How can some plants and animals survive in deserts
4. Why shouldn't we cut down too many trees in the forests
5. What do many people do on plains
五、书面表达
Write a passage about your favourite landscape. You should introduce what it is like, why you like it and what you can do in it. (At least 60 words)
参考答案
一、
A. 1. mountains 2. place 3. cover 4. desert 5. far
B. 1. is 2. rivers 3. clean 4. night 5. covered
解析：
1. 根据“are very high and dangerous”可知此处是说山很高很危险，用名词复数 mountains。
2. 森林是一个美丽和平的地方，用名词 place。
3. 海洋覆盖地球的大部分面积，主语是复数，动词用原形 cover。
4. 根据“very dry and there is little water”可知是沙漠，用名词 desert。
5. 平原很开阔，你能看得很远，far 表示“远的”。
6. 分数表达，分子用基数词，分母用序数词，当分子大于 1 时，分母用复数，two thirds 三分之二，主语是不可数名词，谓语动词用 is。
7. one of + 形容词最高级 + 名词复数，表示“最......之一”。
8. keep + 宾语 +形容词，表示“使......保持......”，用 clean。
9. at night 固定短语，表示“在晚上”。
10. be covered with 固定短语，表示“被......覆盖”。
二、
1. A 2. A 3. D 4. C 5. C
解析：
1. 根据回答可知是问关于沙漠知道什么，用 What。
2. rise 表示“升起，上升”，raise 表示“举起，提高”，get 表示“得到”，go 表示“去”，此处是说河流从山上升起，用 rises。
3. 根据“Forests help to make the air clean and fresh.”可知森林有好处，所以最喜欢森林，用 forests。
4. 分数表达，three quarters 四分之三。
5. 回答是长度，所以问长度用 long。
三、
1. keep; clean
2. What are
3. Where do
4. Are; are
5. Plains are open and flat and they cover over one third of the world's land area.
解析：
1. help (to) do sth. = help do sth. 帮助做某事，make sth. + 形容词 = keep sth. + 形容词，表示“使某物......”。
2. 询问天气用 What's the weather like 或 How's the weather 此处对天气提问，用 What are。
3. 对地点提问用 where，主语是 rivers，助动词用 do。
4. 有 be 动词的句子变一般疑问句把 be 动词提前。
5. 原句就是两个简单句合并为一个并列句。
四、
A. 1. F 2. F 3. T 4. T 5. F
B. 1. Because it's a great challenge.
2. We should stop polluting the oceans.
3. They have special ways to store water and adapt to the hot and dry environment.
4. Because forests are home to many animals and plants.
5. They live and grow crops.
解析：
A. 1. 根据“Mountains are very high and beautiful.”可知山是美丽的，所以错误。
2. 根据“Oceans cover more than two-thirds of the earth's surface.”可知海洋覆盖超过三分之二的地球表面，所以错误。
3. 根据“It is very hot during the day and very cold at night.”可知晚上很冷，所以正确。
4. 根据“They help to make the air clean and fresh.”可知森林能使空气干净，所以正确。
5. 根据“Plains are often used for farming.”可知平原适合耕种，所以错误。
B. 1. 根据“Some people like climbing mountains because it's a great challenge.”可知是因为是很大的挑战。
2. 根据“But we should protect the oceans because there is a lot of pollution now.”可知应该停止污染海洋。
3. 文中未提及具体方式，可根据常识回答它们有特殊的储水方式和适应环境的能力。
4. 根据“Forests are home to many animals and plants.”可知因为森林是很多动植物的家。
5. 根据“Many people live on plains and grow crops there.”可知他们居住和种庄稼。
五、
My Favourite Landscape
My favourite landscape is the forest. It is full of green trees and beautiful flowers. The air in the forest is very fresh. I like it because it makes me feel peaceful and relaxed. I can go hiking in the forest, breathe the fresh air and enjoy the beautiful scenery. Sometimes, I can also have a picnic with my friends there. It's really wonderful.

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