题目

某种衣服每件的进价为100元，如果按标价的八折销售时，每件的利润率为20%，则这种衣服每件的标价是        元．  答案：150解析:设每件的标价为x元，由题意得：80%x-100=100（1+20%），解得：x=150．即每件的标价为150元 阅读理解 阅读下列内容，根据短文内容选择最佳答案。 Thomas Edison lit up the world with his invention of the electric light. Without him, the world might still be in the dark. However, the electric light was not his only invention. He also invented the motion picture camera and 1200 other things. About every two weeks he created something new.Thomas Edison was born in 1847. He attended school for only three months. His mother taught him at home, but Thomas was mostly self-educated. He started experimenting at a young age.When he was 12 years old, he got his first job. He became a newsboy on a train. He did experiments on the train in his spare time. Unluckily, his first work experience did not end well. They fired him when he accidentally set fire to the floor of the train. Then Edison worked for five years as a telegraph operator, but he continued to spend much of his time in experimenting his first patent(专利权) in 1868 for a vote recorder run by electricity.Thomas Edison was totally deaf in one ear and hard of hearing in the other, but he thought of his deafness as a blessing in many ways. It kept conversations short, so that he could have more time for work. He always worked 16 out of every 24 hours. Sometimes his wife had to remind him to sleep and eat.Thomas Edison died at the age of 84. He left a great many inventions that greatly improved the quality of life all over the world.1.How often did Edison make a new invention?A. About every fourteen days B. About every seven days C. About once a week D. About twice a week2.The underlined word “fired” in the passage means “__________”A. Gave somebody a job B. Set fire to somebodyC. Let somebody down D. Forced somebody to leave his job3.Edison considered his deafness as______.A. something bad B. a gift from godC. a kind of ability D. a disadvantage4.Which of the following sentence is NOT true according to the passageA. Edison had only 8 hours rest each day after his deafness ?B. Edison got his education mostly by self-teachingC. Edison had his first job in 1869D. Edison’s inventions greatly improved the quality of people’s life5.What does the passage mainly talk about?A. The function of the electric lightB. Edison and his experimentsC. The importance of inventionsD. The whole life of Edison.