题目内容：

    These days when someone says a computer has a bug in it, usually they mean that there's a problem with one of its programs. Maybe your computer has crashed when you are in the middle of a game, or you get an error message when you try to go to a website.

But back in the early days of computers, a woman named Grace Hopper was part of the tear that discovered the very first computer bug.

Hopper was a mathematician. She'd been hired by the navy to help program the new Mark II computer. The Mark Ⅱ’s job was to quickly solve the math problems ships and airplanes used to find in their way. The MarkⅡ worked by reading instructions from a long strip of paper with holes in it. The computer translated the patterns of holes into the math problems it was supposed to solve.

One afternoon in 1947 Hopper and her team were running a program. But the computer wasn’t giving them the right results. What could be wrong? They finally ended up taking the Mark II apart, looking for problems. What did they find?

It was a dead moth(蛀虫)! The moth was blocking some of the holes on the paper strip—no wonder the computer didn't know what to do.

Hopper knew that the term "bug" had been used before when there were problems with machines. But this was the first time a computer had ever had one. She thought it was funny that it was a real bug. Some people think Hopper was the first person to use the word "debug" to mean “get rid of the problems in a computer”.

Her team kept a logbook of everything they did. They taped the moth onto the page for that day. The logbook, moth and all, is now in the Smithsonian Museum of American History in Washington D.C.

Grace Hopper worked with computers her whole life. She was the first person to write a word-based computer language. This makes it easier for people to tell computers what to do. Some people called her "Grandma COBOL" after one of the computer languages she helped develop. But to most she was just “Amazing Grace”.

1.What's the writer's purpose in writing paragraph 1?

A. To tell us the main idea of the passage.

B. To arouse the readers' interest to read on.

C. To show the structure of the passage.

D. To give a description of what a bug is.

2.Which of the followings is true to describe Grace Hopper?

A. She was the first expert to use the term “bug”.

B. She was an astronomer to help work on the Mark II.

C. She devoted all her life to work related to computers.

D. She kept a record of all the computers on the Mark II.

3.What is the text mainly about?

A. The history of bug. B. The discovery of the first bug.

C. Grace Hopper and her bug. D. Grace Hopper and the Mark II.