题目：
| 完形填空。 | |||
| Do you often watch TV? Maybe (也许) your l is "yes". Most children like watching TV 2 it's interesting and relaxing. They can also learn a lot and know 3 things about their country and the world. Of course, they can also learn over the radio. They can learn something quickly from those TV programs because they can hear and watch at the same time. But they can't see 4 over the radio. TV helps to open children's eyes. TV can open their minds. They can learn some better ways of 5 things. Many children are always 6 with their studies, so they watch TV only on weekends. 7 some children watch TV every night. They go to 8 very late and they can't have a good rest. And they will have less time 9 their lessons and fall behind other students. So when you want to watch TV, you must remember, "Study must come first." What do you 10 it? | |||
| ( )1. A. ask ( )2. A. so ( )3. A. a lot ( )4. A. something ( )5. A. doing ( )6. A. free ( )7. A. And ( )8. A. the bed ( )9. A. do ( )10. A. think | B. answer B. because B. lot of B. anything B. to do B. busy B. But B. their beds B. does B. think of | C. question C. but C. lots of C. nothing C. do C. tired C. Because C. bed C. to do C. like | D. say D. and D. a lots of D. someone D. does D. friendly D. or D. beds D. did D. like of |
答案：
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.题目分析：找出方程2x2+3x-4=0的二次项系数，一次项系数，得到a，b的值，由x1、x2是方程2x2+3x-4=0的两实数根，利用根与系数的关系可求出两根之和．试题解析： x1、x2是方程2x2+3x-4=0的两实数根，∴x1+x2=．考...
