下列有关人的个体发育过程的叙述，不正确的是（　　）

A．个体发育起始于受精卵

B．胎儿通过胎盘与母体进行物质交换

C．进入青春期后，神经系统的结构和功能没有明显变化

D．进入青春期后，愿意与异性接近是正常的心理变化

用所给单词的正确形式填空。

1. Last football match was very ________ (excite).

2. ________ (stay) up late is bad for your health.

3. Why don't you ________ (give) up smoking?

4. My parents didn't feel ________ (good) last Sunday.

5. ________ (not walk) on the lawn. We must protect (保护) our environment.