400,000.

3. Then, another big quake which was almost as strong as the first one shook Tangshan.

4. The army organized teams to dig out those who were trapped and to bury the dead.

Ⅶ.语言点：

1.Imagine your home begins to shake and you must leave it right away...

　　imagine:

　　imagine + n. /pron./ G./ cl.

　　imagine sb. to be

　　shake : cause to move to and fro

　　right away : at once ; in no time ; immediately

　　right now : at this very moment

　　Make up your mind___________.

　　I'll return the book___________.

2.burst : to come open or fly apart suddenly

　　The balloon suddenly burst.

　　burst into + n.

　　Some robbers burst into that house.

burst out