题型:完形填空 完形填空。 One day Mark Twain was invited to __1__ a talk in a small town, He met a young man, one of his friends. The young man said that he had an uncle, his uncle __2__ laughed or smiled. "you bring your uncle to my talk tonight," said Mark Twain. "I'm sure I can make him laugh."That evening the young man and his uncle sat __3__ the front. Mark Twain told several funny stories. __4__ made everyone in the room laugh. But the old man never __5__ smiled. Mark Twain told __6__ funny stories, but the old man still kept __7__. Finally, he stopped. He felt very tired and gave up.__8__ later, Mark Twain told a friend of his about __9__ had happened, "Oh", said his friend, "I know that old man. He has been _10__ for years."( ) 1. A. give ( ) 2. A. often ( ) 3. A. in ( ) 4. A. those ( ) 5. A. even ( ) 6. A. most ( ) 7. A. quietly ( ) 8. A. these days ( ) 9. A. which ( ) 10. A. foolish B. send B. sometimes B. with B. this B. ever B. more B. quite B. some days B. how B. deaf(聋) C. make C. never C. on C. these C. still C. much C. quiet C. other days C. what C. blind D. work D. always D. at D. that D. yet D. the most D. laughing D. those days D. that D. dead 查看答案
题型:计算题 工业上可用电解饱和食盐水的方法制备氢氧化钠,反应原理是: 2NaCl +2H2O2NaOH +Cl2 ↑ +H2 ↑ 若电解含氯化钠23.4 t的饱和食盐水,则可制得氢氧化钠多少吨?(写出计算过程) 查看答案