张謇在《马关条约》签订后，提出了“____”的口号，并毅然回乡创办了____  等一系列企业。

现有三个自愿献血者,两人血型为O型,一人血型为A型.若在三人中随意挑选一人献血,两年以后又从此三人中随意挑选一人献血,试求两次所献血的血型均为O型的概率(要求：用列表或画树状图方法解答)

根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    Jimmy is an English boy. He wants to have a friend in China. He likes 1 very much. It's relaxing for him. He plays sports 2 his classmates after class. He has five soccer balls, two 3 and one basketball. But he doesn't like tennis. He thinks it's 4. 

Jimmy has a healthy eating 5. He likes fruit and vegetables. 6 are his favorite (最喜欢的) vegetables. He often (经常) has fruit salad 7 dinner. He doesn't eat 8 or ice-cream. He doesn't want to be 9. 

    Do you like him? Do you 10 to be his friend? You can e-mail him at jimmy 012@ yahoo.cn.