下列各项措施中，有利于生态系统稳定的是（　　）

为了美化城市，经统一规划，将一正方形草坪的南北方向增加3m，东西方向缩短3m，则改造后的长方形草坪面积与原来正方形草坪面积相比（　　）

已知三角形三边的长分别为15、20、25，则这个三角形的形状是____．

用所给词的适当形式填空 
1. She wants ____(read) a book.
2. Her keys ____ (be) on the dresser.
3. Are ____(that) oranges?
4. Jim and Tom ____ (have ) a basketball.
5. He has four ____(watch).
6. Please take the books to ____ (they).
7. Jim____(not play) sports every day.
8. ____ (thank) for your help.
9. This book is very ____(interest).
10. My father ____ (need) a new bike.

—Yes. I often talk       the NBA games       my friends.