“康有为──梁启超──林旭──杨深秀”按照这四个人物归类的标准，再从以下四个人物中选一个（　　）

A．石蜡+氧气 $\stackrel{点燃}{\to }$ 二氧化碳+水

B．红磷+氧气 $\stackrel{点燃}{\to }$ 五氧化二磷

C．生石灰+水→熟石灰

D．____．

①减数分裂包括两次连续的细胞分裂

②在次级精母细胞中存在同源染色体

③着丝点在第一次分裂后期一分为二

④减数分裂的结果是染色体数减半，DNA数不变

⑤同源染色体分离，导致染色体数目减半

⑥联会后染色体复制，形成四分体

⑦染色体数目减半发生在第二次分裂的末期。

阅读短文，从各题所给的选项中选择最佳选项。    

    It was Friday night and Marty was relaxing in a chair. His mom was washing the dishesin the kitchen. But before she could finish, 1 didn't feel well and had to stop. She said she would do it after a  2  .

    "Are you OK, mom?" asked Marty.

    His mom said, "Yes, I'm fine. But I need to rest." Then she went to 3  .

    Marty felt a little 4 . He knew he should help his mom more.   5 when his mother rested, he 6 all the dishes and cleaned the kitchen. The kitchen was very clean and Marty felt much better.

    When Marty's mom woke up, she thought she had  7 to do. She had to clean the kitchen and wash all the dishes. But when she went to the kitchen, she could not believe her  8  . The kitchen was so clean. She  9 Marty for all his work. She told him he was a really nice boy.

    On that day, Marty learned that 10 others makes everyone happy. It makes others feel happy, and it makes you happy, too.