21.The annual rainfall ____ from place to place.
A: shifts
B: alters
C: converts
D: varies
A: shifts
B: alters
C: converts
D: varies
举一反三
- Deserts and high mountains have always been a ________ to the movement of people from place to place.
- In the past 30 years, great changes ___(take place) in our country. A: took place B: take place C: have taken place D: were taking place.
- Rainfall is the amount of wind that falls in a place during a period.
- Deserts and high mountains have always been a ________ to the movement of people from place to place. A: barrier B: fence C: prevention D: jam
- The place ( ) you are going to visit is the ruin of a place.