我国1～14岁儿童意外伤害死亡的第一位原因是什么？

把3×6=2×9改写成一个比例式______．

桥式起重机的司机室门及登上桥架的舱口门均应设置（）。

A、信号按钮

B、联锁保护装置

C、自锁装置

什么是特性要因图？

以下关于民事法律关系的说法，正确的是（）。

A.由民事法律规范所调整、确认和保护的社会关系

B.是当事人之间所发生的权利义务关系

C.属于上层建筑的思想社会关系

D.是民法调整社会关系的中介

E.是受国家强制力所保障实现的社会关系

Directions:

You just spent your summer holidays in Tom’s hometown, Tom’s home is at a small and quiet countryside. Now, you are going to write him a letter of thanks for all he and his family did for you during your stay there.

Imagine some details of the summary holidays. Write your letter in no less than 100 words. Write it nearly on ANSWER SHEET 2.

Do not sign your own name at the end of the letter; use "Li Ming" instead.

Do not write the address, (10 points)