五、首字母填空
The striking(引人注目的）features of Mars
Compared with the Earth，Mars is a different p 1 which has many striking features. First，Mars is a barren(贫瘠的），cratered(多坑的）w 2. It doesn't have flowing water and luxuriant(茂盛的）plants，more l 3 the Moon. In other words，Mars is different. Second，much of Mars's s 4 consists of dust. Third，Mars is extremely w 5. The wind is so strong that it can change the landscape. What's m 6 ，extreme(极端的）climate is the f 7 striking feature. Although Mars has s 8 like Earth's，they all have extreme climate. And Mars' atmosphere(大气层）is so thin that it has a very low heat capacity(容量），so the surface t 9 swings(改变）by more than 100 degrees. A fifth major striking feature is that the behaviour of liquid(液体）water is unstable(不稳定的）because of Mars' present pressure and temperature c 10.
1. _______ 2. _______ 3. _______ 4. _______ 5. _______
6. _______ 7. _______ 8. _______ 9. _______ 10. _______

五、1. planet 2. world 3. like 4. surface 5. windy 6. more 7. fourth 8. seasons 9. temperature 10. conditions