【正文】
ys. 11. Evidently, it has both negative and positive effects. 12. People used to think ..., but things are different now. 13. The same is true of B. 14. Wondering as A is ,it has its drawbacks. 15. It is true that A ... , but the chief faults (obvious defects )are ... 二)原因 number of factors are accountable for this situation. A number of factors might contribute to (lead to )(account for ) the phenomenon(problem). 2. The answer to this problem involves many factors. 3. The phenomenon mainly stems from the fact that... 4. The factors that contribute to this situation include... 5. The change in ...largely results from the fact that... 6. We may blame ...,but the real causes are... 7. Part of the explanations for it is that ... One of the most mon factors (causes ) is that ... Another contributing factor (cause ) is ... Perhaps the primary factor is that … But the fundamental cause is that ... 三)后果 1. It may give rise to a host of problems. 2. The immediate result it produces is ... 3. It will exercise a profound infl