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(3分) 蛋白质是由多种氨基酸构成的极为复杂的化合物。丙氨酸是众多氨基酸中的一种，其化学式为

，丙氨酸的组成元素有_______种，一个丙氨酸分子中共有________个原子。相对分子量

3月29日是校园安全教育日，请你以“创建平安校园”为主题，根据以下三个方面的提示写一篇英语演讲稿。

How to keep safe in school
In P.E. classes	In the dining hall	In the science lab
wear sports shoes do warming up exercises …	don’t run wait in line …	keep your hands away from don’t work alone …

注意：文中不得出现真实的姓名、学校名；80-100词左右，短文开头已给出，不计入总词数。
Hello, everyone! It’s very important for us to keep safe in school.

3月29日是校园安全教育日，请你以“创建平安校园”为主题，根据以下三个方面的提示写一篇英语演讲稿。

How to keep safe in school

In P.E. classes

In the dining hall

In the science lab

wear sports shoes

do warming up exercises

…

don’t run

wait in line

…

keep your hands away from

don’t work alone

…

注意：文中不得出现真实的姓名、学校名；80-100词左右，短文开头已给出，不计入总词数。

Hello, everyone! It’s very important for us to keep safe in school.

3-junior high school life will be over . I will remember those things and teachers _____ are unforgotten .

A．who

B．which

C．that

D．whom

3, He speaks ______English ______French. Instead, he speaks German.

A either;or B not only; but also

C both;and D neither; nor