eptune after a journey of three and a half years.
2)Five probes were sent to rendezvous with Halley’s comet.
3)Exploration of the solar system is more or less under way.
5. Do you think there are inhabited planets? Why or why not?
Yes, I think there are, because no matter how far back into the universe we look, we find the same elements: atoms, molecules, stars, galaxies. We can show that the laws of physics have remained unchanged through 15 billion light years.
第六单元《草地上的黄昏劫案》以词汇为主，重点在练习Vocabulary题。
第七单元《适者生存》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。
回答问题Question：
1．What kind of change is evolutionary change?
If the new creature is able to reproduce itself so that its young also have the new color. This change in color is evolutionary change.
2. Why did the Peppered Moth begin to change color in the industrial areas?
In industrial areas, pollution covered barks with soot and grime. The darker Peppered Moths were less visible and more likely to survive. So Peppered Moths began to change color.
3. What method is employed in the development of Paragraph 5?
Definition giving method.
4. What is natural selection?
A mutation happens to suit a new environment, and the ‘odd’ creature survives because it is better fitted. Then it reproduces and a new type of creature evolves. Meanwhile the others have become unsuited to the changed environment. They must either change their behaviour or become extinct.
5. Smoke control progammes have been introduced in industrial regions in Britain since 1952. What prediction can you make about the Peppered Moth?
The Peppered Moths will become lighter in color.
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