一．词汇A根据首字母提示及英文释义和所给中文完成单词
1.It is said that there are eight p______ (a large body in space that moves around a star) in the solar system.
2. Should we be able to d__________ (grow and improve) plants that can grow on Mars?
3. The first s_________ (people who go to live a new place) in America got on well with Indians.
4. The p (number of people) of China is the largest in the world.
5. The earth is more and more p (to be made dirty) because of people.
