阅读理解。根据短文内容，判断正(T)误(F)。
In your schoolbag most of the things may be a pencil, some kinds of pens, a ruler and some books. These
things don't grow in the fields. They were all made in factories and invented by someone. Thousands of years
ago no one knew about these things.
Who invented them? We don't always know. There have been many large and small inventions. In human
history, some of these inventors have been forgotten by humans. Who invented the clock, or the lock on the
door? We don't know. There have been thousands of inventions and we should thank the inventors for their
clever ideas. Will you be one of them when you grow up?
( ) 1. Most of the things in your schoolbag are grown in the fields.
( ) 2. People didn't have such things as pens or rulers thousands of years ago.
( ) 3. We know who invented all these things.
( ) 4. In human history, many of these inventors have been forgotten by humans.
( ) 5. We don't know who invented the lock on the door.
