求助大全SC4 9, 11和15

9. Many psychologists and sociologists now contend that deliberate and even brutal aggression integral to some forms of competitive athletics increase the likelihood of imitative violence that erupts among crowds of spectators dominated by young adult males.

答案：E

increases the likelihood that imitative violence will erupt

两个问题：1.这里为什么用increases，它的动作发出者是哪位？2. erupt为什么是将来时态？

我两个关键语法点都错了。

11.Several studies have found that the coronary patients who exercise most actively have half or less than half the chance of dying of a heart attack as those who are sedentary.

B. have half the chance, or less, of dying of a heart attack than those who are sedentary do

问题，B为什么不行？

15. According to his own account, Frederic-Augusts Bartholdi, the sculptor of the Statue of Liberty, modeled the face of the statue like his mother's and the body like his wife's.

B. modeled the face of the statue after that of his mother and the body after that of his wife

问题：A不选的理由是不是mother's和wife's可能会指代statue？B中两个that，明显指代不同东西，同一个代词在一句中前后指代不同事物可以么？

谢谢！！！

难道这么简单，大家都没问题，就我有问题？

对了，哪位有带解释的大全呀？我下的PDF版本的大全没有解释