题目内容：

On July 24, 1916, a natural gas explosion trapped 32 men working in a tunnel 250 feet below Lake Erie. The first rescuers who entered the tunnel were _______ by gas, and for hours no one else dared to enter the suffocating (窒息的),_______ deathtrap.

Then, late that night, someone had an idea:_______ Garrett Morgan and his new invention. Garrett Morgan was a successful _______ owner in Cleveland. The son of freed slaves and the seventh of 11 children, mechanically minded Morgan had opened his own sewing machine shop, which he soon _______ to a tailoring factory with 32 employees.

In the early 1900s, factory buildings were crowded and untidy. They were often _______ of wood, with no fire escapes. Fire could cause serious _______. Concerned about his employees, Morgan _______ with a “safety hood” (头罩) that would allow the wearer to _______ despite a fire’s poisonous smoke.

Morgan knew smoke rises during a fire.________, he created a heat-resistant hood with a long tube reaching to the floor. Wearing Morgan’s hood, a firefighter could breathe the ________ air near the ________ Morgan lined the breathing tube with a sponge-like material that was wetted before use to ________ the air. A second tube was designed to ________ exhaled (呼出的) air.

Called to the scene on the night of the tunnel explosion, Garrett arrived with samples of his safety hood. Still in their nightwear, he and his brother Frank put on the hoods and ________ entered the tunnel. It was a dangerous ________ of the invention, but they saved two lives and ________ four bodies before officials closed the ________. Morgan knew that more lives might have been saved if he had been called sooner.

The daring ________ made Morgan famous and brought requests for safety hoods from fire departments around the country. But his greatest ________ was knowing that his invention would now save more people.

1.A. lit    B. powered    C. overcome    D. overheated

2.A. changeable    B. remarkable    C. cautious    D. poisonous

3.A. show off    B. send for    C. rule out    D. take away

4.A. factory    B. slave    C. restaurant    D. store

5.A. declined    B. decided    C. expanded    D. exported

6.A. afraid    B. true    C. consisted    D. made

7.A. business    B. damage    C. illness    D. doubts

8.A. experimented    B. associated    C. equipped    D. struggled

9.A. exist    B. communicate    C. breathe    D. listen

10.A. Therefore    B. However    C. Anyway    D. Besides

11.A. cleaner    B. thicker    C. colder    D. warmer

12.A. ceiling    B. ground    C. roof    D. window

13.A. feel    B. trap    C. cool    D. heat

14.A. put on    B. get off    C. pollute    D. release

15.A. unwillingly    B. bravely    C. gradually    D. simply

16.A. task    B. test    C. game    D. part

17.A. overlooked    B. identified    C. recovered    D. buried

18.A. gap    B. case    C. deal    D. site

19.A. rescue    B. attempt    C. reform    D. escape

20.A. fortune    B. comfort    C. achievement    D. reward