书名：Smart Reading:跟美国学生同步学科学（英文原版）（Grade 6 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：30618400

ISBN：

正文语种：英文

字数：43970

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 head, neck, tail, and wings of the emperor penguin are all black. It has bright orange patches on its ears and several layers of waterproof down feathers for insulation.

<!--[if !supportLists]-->2) <!--[endif]-->King penguins mostly eat small fish, squid, krill, and shellfish.

<!--[if !supportLists]-->3) <!--[endif]-->King penguins have a special gland for filtering salt, so they can drink salt water.

<!--[if !supportLists]-->4) <!--[endif]-->After king penguin eggs are laid, the male takes care of it while the female goes hunting in the sea to fatten up.

<!--[if !supportLists]-->5) <!--[endif]-->After king penguin chicks are born, both parents take turns taking care of them.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->feathers: Feathers help keep birds warm.

<!--[if !supportLists]-->2) <!--[endif]-->insulation: Waterproof, down feathers provide good insulation for king penguins.

<!--[if !supportLists]-->3) <!--[endif]-->waterproof: Feathers that are waterproof cannot be soaked by water.

<!--[if !supportLists]-->4) <!--[endif]-->shellfish: Clams, mussels, and oysters are examples of shellfish.

<!--[if !supportLists]-->5) <!--[endif]-->regurgitated: Food that is regurgitated is eaten and then brought up for babies to eat.

III. True, false, or not given:

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

Lesson 2

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->Experiments are important because they can provide an answer to a hypothesis. However, when experiments are not possible we can also learn a lot from observation.

<!--[if !supportLists]-->2) <!--[endif]-->Experiments can often give clearer answers because in nature there are often too many variables to know why something happened.

<!--[if !supportLists]-->3) <!--[endif]-->Observation is so important for an astronomer because while he or she cannot travel across space, it is still possible to learn a lot about stars through observation combined with experiments.

<!--[if !supportLists]-->4) <!--[endif]-->A hypothesis is an idea about why and how things happen.

<!--[if !supportLists]-->5) <!--[endif]-->Conducting experiments is not always possible, because we cannot always reach the places we need to in order to conduct the experiment.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->hypothesis: A hypothesis can be proven true or false by conducting an experiment.

<!--[if !supportLists]-->2) <!--[endif]-->observation: Observation is important when looking far into space.

<!--[if !supportLists]-->3) <!--[endif]-->variables: Variables are possible explanations for why something happened.

<!--[if !supportLists]-->4) <!--[endif]-->evidence: Evidence can help prove that a hypothesis is true.

<!--[if !supportLists]-->5) <!--[endif]-->investigate: When we investigate, we try to find answers.

III. True, false, or not given

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

Lesson 3

I. Answer the following questions

<!--[if !supportLists]-->1) <!--[endif]-->We can make yeast come to life by making it moist and warm.

<!--[if !supportLists]-->2) <!--[endif]-->The main difference between yeast and plants is that plants can make their own food, but yeast cannot.

<!--[if !supportLists]-->3) <!--[endif]-->In the experiment, balloon 2 does not inflate because yeast does not ferment and produce carbon dioxide without sugars to feed on.

<!--[if !supportLists]-->4) <!--[endif]-->Fermentation is a chemical reaction that happens when yeast breaks down sugar to make energy.

<!--[if !supportLists]-->5) <!--[endif]-->Answers will vary. Example – Yes, I like this experiment because it is fun and educational!

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1) <!--[endif]-->yeast: Yeast is needed to make bread.

<!--[if !supportLists]-->2) <!--[endif]-->inflate: To inflate a balloon is to blow it up.

<!--[if !supportLists]-->3) <!--[endif]-->dormant: Something that is dormant is not active.

<!--[if !supportLists]-->4) <!--[endif]-->cloudy: Liquid that is cloudy is not clear.

<!--[if !supportLists]-->5) <!--[endif]-->rise: Yeast is necessary for bread to rise.

III. True, false, or not given

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

Lesson 4

I. By the numbers

<!--[if !supportLists]-->1) <!--[endif]-->3 million: the number of fossils that have been found in the La Brea Tar Pits

<!--[if !supportLists]-->2) <!--[endif]--> 40000: the number of years ago that scientists in the Los Angeles area are learning about

<!--[if !supportLists]-->3) <!--[endif]--> carbon 14: the kind of carbon that is used for radiometric dating

<!--[if !supportLists]-->4) <!--[endif]--> 5730: the number of years it takes for half of carbon 14 to become stable

<!--[if !supportLists]-->5) <!--[endif]--> 8000 to 38000: the number of years old that most fossils in the La Brea Tar Pits are

II. Answer the follow

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