书名：Smart Reading：跟美国学生同步学科学（英文原版）（Grade 8 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：30618402

ISBN：

正文语种：英文

字数：52898

版次：1

所属分类：外语学习-留学英语

Lesson 1

I. By the numbers

<!--[if !supportLists]-->1)<!--[endif]-->30 metres: the height a tsunami can reach

<!--[if !supportLists]-->2)<!--[endif]-->800 kilometres per hour: the speed a tsunami can reach

<!--[if !supportLists]-->3)<!--[endif]-->230000: the number of people killed by the 2004 tsunami in the Indian Ocean

<!--[if !supportLists]-->4)<!--[endif]-->23000 atomic bombs: the estimated power of the 2004 tsunami in the Indian Ocean

<!--[if !supportLists]-->5)<!--[endif]-->14 countries: the number of countries where people were killed by the 2004 tsunami in the Indian Ocean

II. Answer the following questions

<!--[if !supportLists]-->1)<!--[endif]-->The main causes of tsunamis are earthquakes, volcanoes, and landslides.

<!--[if !supportLists]-->2)<!--[endif]-->Tsunamis are so dangerous because of their incredible speed and strength.

<!--[if !supportLists]-->3)<!--[endif]-->Just before a tsunami hits the shore, the coastal water is sucked away from shore, exposing the ocean floor.

<!--[if !supportLists]-->4)<!--[endif]-->Most tsunamis happen in the Pacific Ocean’s Ring of Fire.

<!--[if !supportLists]-->5)<!--[endif]-->Answers will vary. Example – If I were hit by a tsunami, I would try to grab onto something that floats.

III. True, false, or not given

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

Lesson 2

I. Answer the following questions

<!--[if !supportLists]-->1)<!--[endif]-->Salt water is important for our planet because it is estimated that 50% of all creatures on Earth are supported by salt water ecosystems.

<!--[if !supportLists]-->2)<!--[endif]-->Our kidneys cannot handle too much salt water and it causes the body to shut down.

<!--[if !supportLists]-->3)<!--[endif]-->Brackish water is where fresh water and salt water meet.

<!--[if !supportLists]-->4)<!--[endif]-->Most of Earth’s oxygen comes from forests and salt water.

<!--[if !supportLists]-->5)<!--[endif]-->Answers will vary. Example – The closest body of salt water to where I live is the Pacific Ocean.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1)<!--[endif]-->brackish: Brackish water is part fresh water and part salt water.

<!--[if !supportLists]-->2)<!--[endif]-->ecosystem: Salt water is the largest ecosystem on Earth.

<!--[if !supportLists]-->3)<!--[endif]-->runoff: Fresh water entering the ocean is called runoff.

<!--[if !supportLists]-->4)<!--[endif]-->drinkable: For humans salt water is not drinkable.

<!--[if !supportLists]-->5)<!--[endif]-->equipped: Some boats are equipped to remove salt from salt water to make it drinkable.

III. True, false, or not given

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

Lesson 3

I. Answer the following questions

<!--[if !supportLists]-->1)<!--[endif]-->Vitamin D is needed in order for the body to absorb calcium.

<!--[if !supportLists]-->2)<!--[endif]-->Dairy products, orange juice, tofu, collard greens, white beans, almonds, bok choy, rhubarb, and broccoli are good sources of calcium.

<!--[if !supportLists]-->3)<!--[endif]-->Answers will vary. Example – My favourite food with calcium is almonds.

<!--[if !supportLists]-->4)<!--[endif]-->Calcium helps doctors because it shows up bright white in x-rays.

<!--[if !supportLists]-->5)<!--[endif]-->Answers will vary. Example – I think if we don’t eat enough food that has calcium, our bones will weaken.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1)<!--[endif]-->spongy: Spongy material is soft.

<!--[if !supportLists]-->2)<!--[endif]-->calcium: Dairy products are a good source of calcium.

<!--[if !supportLists]-->3)<!--[endif]-->ingest: To ingest is to take food into the body.

<!--[if !supportLists]-->4)<!--[endif]-->connective: Cartilage is a connective tissue.

<!--[if !supportLists]-->5)<!--[endif]-->nonmetal: Calcium is effective for removing nonmetal from various metal mixes.

III. True, false, or not given

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

Lesson 4

I. Answer the following questions

<!--[if !supportLists]-->1)<!--[endif]-->A lunar eclipse involves the Moon, while a solar eclipse involves the Sun.

<!--[if !supportLists]-->2)<!--[endif]-->The Sun produces its own light and is much brighter than the Moon, which does not produce its own light.

<!--[if !supportLists]-->3)<!--[endif]-->Answers will vary. Example – I think more can view a solar eclipse because it is safer and easier to see.

<!--[if !supportLists]-->4)<!--[endif]-->Answers will vary. Example – Yes, I once saw a lunar eclipse. The Moon looked very red!

<!--[if !supportLists]-->5)<!--[endif]-->The Danjon Scale could be useful for people it terms of helping inform them when the best time is to look at the Moon during an eclipse.

II. Word power: (Answers will vary)

<!--[if !supportLists]-->1)<!--[endif]-->eclipse: An eclipse occurs when one celestial body passes in front of another.

<!--[if !supportLists]-->2)<!--[endif]-->solar: Solar refers to the Sun.

<!--[if !supportLists]-->3)<!--[endif]-->lunar: Lunar refers to the Moon.

<!--[if !supportLists]-

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