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        1. 以下是從本單元課文中摘出的原句。試試看,能填上嗎?要注意詞形變化!

          1.Many scientists believe that the earth, ________ the sun and other planets in our solar system, was formed ________ five billion years ago.

          2.Nearly three-quarters of the earth's surface ________ water.The earth is the only planet ________ water can ________ on the surface.

          3.Almost all of this water ________ the oceans which ________ keeping the earth's temperature relatively stable.

          4.These ________ heat ________ as they change into other elements.

          5.The pressure of the rock above keeps most materials ________.

          答案:
          解析:

            1.a(chǎn)s well as; at least

            2.is covered with; on which; exist in liquid form

            3.makes up; play a very important role in

            4.give out; all the time

            5.from melting


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