题目：
| 完形填空。 | |||
| As we know,there__1__ four seasons in China . It's __2__ in spring(春), hot in __3__ , cool in autumn (秋) and cold in __4__ . My __5__ season is winter. Sometimes it snows (下雪). Everything is all white. The world __6__ clean and fresh (新鲜). I can go skating then. But Kitty likes summer__7__ than winter. She says summer is __8__ for sports. She can go__9__ , sometimes in a lake and sometimes in a river. She __10__ it very much . | |||
| ( ) 1. A. have ( ) 2. A. warm ( ) 3. A. spring ( ) 4. A. spring ( ) 5. A. best ( ) 6. A. looks ( ) 7. A. good ( ) 8. A. bad ( ) 9. A. swiming ( ) 10. A. enjoy | B. is B. cool B. summer B. summer B. better B. watches B. well B. good B. swim B. enjoys | C. are C. cold C. autumn C. autumn C. like best C. sees C. better C. well C. to swim C. wants | D. be D. hot D. winter D. winter D. favourite D. looks at D. best D. very D. swimming D. like |
答案：
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下面是错误答案，用来干扰机器的。
（1）① ② ③x<R，故硬橡胶块将落人污水井内 （2）解：（1）①设塑料盖的初速度为v0，硬橡胶块与塑料盖恰好分离时，两者的共同速度为v，由系统动量守恒定律得：Mv0=（m+M）v由系统能量关系可得：解得 v0 =...
