( )16. Without the sun, there would be no living things on the earth.
( )17. The earth is the smallest of all the planets of the sun.
( )18. We only receive a small part of light from the sun. The light is not enough for trees and plants to grow on the earth.
( )19. Much heat and light would be good for the living things on the earth.
( )20. Every day a lot of heat is given off to the earth by the sun.
Ⅳ. 情景对话。(10分)
Steven: Have you heard that scientists have finished part of the genetic(基因的)map?
Nancy: 1
Steven: If human has the total genetic map, we will hold the power of God.
Nancy: Is that wonderful?
Steven: Certainly. We'll be able to save a lot of wildlife.
Nancy: 2 First, scientists will build up a gene bank. And then they will get to know how to help those animals when they are ill.
Steven: 3
Nancy: Certainly. In fact, this genetic bank is based on human gene.
Steven: 4 At the beginning, it will, but with the research going on, people will find how important it is.
Nancy: 5
Steven: Yes. It will be built up soon.
a. How can we do that?
b. Will be built up soon?
c. What's important about it?
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