【正文】
al 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 actor 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 ... 4. Its consequence canamp。nb pbe so great that... 四)批駁 1)It is true that ..., but one vital point is being left