研究发现，一种名为CPEB的蛋白质与维持长期记忆有关，位于中枢神经系统突触上，这是大脑中连接神经的枢纽。记忆就被存储在这一约有1万亿个神经细胞和突触的复杂网络中。随着经历和知识的不断增多，新的枢纽形成，老的则不断加强。CPEB合成的蛋白质会随着记忆的形成加强突触，使突触可以长期保存这些记忆。
从上文可见，人的大脑能储存记忆的关键部位是( )。

A．大脑中连接神经
B．1万亿个神经细胞
C．突触
D．CPEB合成的蛋白质

用所给单词的正确形式填空。

1. My friends______ ( not play) football on Sunday.

2. He often______ ( swim) in the river every Sunday.

3. It's five o'clock now. Some people in London ______( run ) for trains.

4. —What are they doing?

    —They______ ( listen ) to music.

5. I can't _          ( speak) English , but I can write it.

6. Let's______ ( sweep) the classroom.

7. Yuanxiao______( bring) you good luck all the year round.

8. My mother and I______( clean) our living room now.

9. I want______( paint) my house white.

10. The boy______( watch) TV with his parents in the living room at the moment.