书名：Smart Reading：跟美国学生同步学科学（英文原版）（Grade 7 练习答案）pdf/doc/txt格式电子书下载

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作者：（加）韦恩·埃弗里特著

出版社：天津人民出版社

出版时间：2020-06-01

书籍编号：30618401

ISBN：

正文语种：英文

字数：53716

版次：1

所属分类：外语学习-留学英语

Lesson 1

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->The heart is located slightly to the left in the middle of the chest.

<!--[if !supportLists]-->2) <!--[endif]-->The circulatory system carries oxygen and food to the cells of the body. The blood then returns to the heart.

<!--[if !supportLists]-->3) <!--[endif]-->Blood is composed of red cells, white cells, and platelets floating in a fluid called plasma.

<!--[if !supportLists]-->4) <!--[endif]-->The walls of a vein are much thinner than the walls of an artery.

<!--[if !supportLists]-->5) <!--[endif]-->Plasma carries nutrients from the stomach to be used as fuel for energy. It also helps keep the body warm.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->organ: An organ is part of an organism that has a special, vital function.

<!--[if !supportLists]-->2) <!--[endif]-->hollow: Things that are hollow are not solid.

<!--[if !supportLists]-->3) <!--[endif]-->Chamber: A chamber is a kind of cavity or hole in a plant or the body of an animal.

<!--[if !supportLists]-->4) <!--[endif]-->artery: An artery is a muscle-walled tube forming part of the blood circulation system.

<!--[if !supportLists]-->5) <!--[endif]-->plasma: Plasma makes up over half the blood and carries nutrients from the stomach to be used as fuel for energy.

III. True, false, or not given

<!--[if !supportLists]-->1) <!--[endif]-->NG    2) F    3) F    4) F    5) F

Lesson 2

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->The three basic types of clouds are stratus, cumulus, and cirrus clouds.

<!--[if !supportLists]-->2) <!--[endif]-->The various cloud families are low clouds, middle clouds, high clouds, clouds that develop upwards, and clouds that develop vertically.

<!--[if !supportLists]-->3) <!--[endif]-->Fog is different from other kinds of clouds because it develops at ground level.

<!--[if !supportLists]-->4) <!--[endif]-->Snow sometimes happens instead of rain if the temperature is low enough.

<!--[if !supportLists]-->5) <!--[endif]-->It is a good idea to bring an umbrella outside if there are vertically-formed clouds in the sky because this means there is a good chance of a thunderstorm.

II. Fill in the blanks

<!--[if !supportLists]-->1) <!--[endif]-->droplets 

2) upward 

3) fog 

4) downpour 

5) puffy

III. True, false, or not given

<!--[if !supportLists]-->1) <!--[endif]-->T    2) F    3) T    4) F    5) F

Lesson 3

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->Answers will vary. Example – Two interesting things about lizards are they have a huge range of sizes and while some are carnivores, others are herbivores.

<!--[if !supportLists]-->2) <!--[endif]-->The largest lizards are found in Indonesia, while the smallest are found in the British Virgin Islands.

<!--[if !supportLists]-->3) <!--[endif]-->Lizards often need to shed their skin in order to grow.

<!--[if !supportLists]-->4) <!--[endif]-->The basic body shape of a lizard is a head, a pair of legs, a long body, another pair of legs, and a prehensile tail.

<!--[if !supportLists]-->5) <!--[endif]-->Lizards often stay away from predators by hiding underground or behind rocks during the day.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->lungs: People and animals breathe with their lungs.

<!--[if !supportLists]-->2) <!--[endif]-->prehensile: A tail that is prehensile can grab onto things.

<!--[if !supportLists]-->3) <!--[endif]-->control: A lizard is cold-blooded so it cannot control its body temperature.

<!--[if !supportLists]-->4) <!--[endif]-->creatures: Animals are sometimes called creatures.

<!--[if !supportLists]-->5) <!--[endif]-->herbivore: A herbivore is an animal that eats leaves, fruit, flowers, and other plants.

III. True, false, or not given

<!--[if !supportLists]-->1) <!--[endif]-->F    2) f    3) F    4) NG    5) NG

Lesson 4

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->A population is all the individuals of a species that live together in one place at one time.

<!--[if !supportLists]-->2) <!--[endif]-->Population size refers to how many individuals there are, whereas population density refers to many people live in a certain area such as a square kilometre.

<!--[if !supportLists]-->3) <!--[endif]-->Smaller populations are more at risk of becoming extinct because disasters such as floods or fires could wipe them out completely.

<!--[if !supportLists]-->4) <!--[endif]-->The three main features of dispersion are randomly spaced, evenly spaced, and clumped.

<!--[if !supportLists]-->5) <!--[endif]-->Answers will vary. Example – In the area where I live, the population is evenly spaced.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->offspring: Offspring are the children od plants and animals.

<!--[if !supportLists]-->2) <!--[endif]-->extinct: If an animal becomes extinct, there are none left.

<!--[if !supportLists]-->3) <!--[endif]-->density: Population density is high in la

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