1、优质文档优质文档Do you know 1. What is the earth?2. What is the sun?3. What is the moon?A star B. A satellite C. A planetA star B. A satellite C. A planetA star B. A satellite C. A planet优质文档优质文档4. Where have astronauts already been?A. The Moon B. Mars C. the Sun5. How many planets has the sun got according
2、 to the science book?A. nine B. eight C. seven6. What is the sun and its planets called?A. Solar system B. galaxy C. universe7. Which planet has an environment like the earth? A. Venus B. Mars C. None of them8. How many stars are there in the Galaxy?A. 100 billion B. 200 billion C. 300 billion 9. Ho
3、w many Galaxies are there in the universe?A. 1250 B. 2500 C. 500010. What have scientists sent to the Mars?A. Astronauts B. spaceships C. man-made satellite11. Has the spaceship reached other stars in our galaxy?A. Yes B. Not yet12. How many Chinese astronauts have been to the space?A. seven B. eight C. nine
