问题
单项选择题
下列化学物品中，对肝脏有一定损害的是( )。
A．四氯化碳
B．汞
C．铊
D．铭
答案
参考答案：A
解析：肝脏的作用就是净化血液中的有毒性危险化学品，并将其转化成无害的和水溶性的物质。然而有一些物质对肝脏有害，例如溶剂酒精、氯仿、四氯化碳、三氯乙烯等。
搜题请搜索小程序“爱下问搜题”
下列化学物品中，对肝脏有一定损害的是( )。
A．四氯化碳
B．汞
C．铊
D．铭
参考答案：A
解析：肝脏的作用就是净化血液中的有毒性危险化学品，并将其转化成无害的和水溶性的物质。然而有一些物质对肝脏有害，例如溶剂酒精、氯仿、四氯化碳、三氯乙烯等。
| 完形填空。 | |||
| Every country has its own dining customs. Americans feel that the first rule of being a 1 guest is to be on time. If a person is invited to dinner at six thirty, the hostess 2 him to be there at six thirty or 3 a few minutes after. Because she usually does the cooking, she has to time the meal 4 the hot rolls and the coffee and the meat can be at their best when the guests come. If they are late, the food will not be so 5 , and the hostess will be 6 . 7 the guest cannot come on time, he should call his host or hostess on the phone, give the reason, and tell 8 what time he can come. 9 the situations, guests sometimes bring a box of candy, a bottle of wine or a bunch of flowers to give to the hostess as a 10 of appreciation. As guests continue to arrive, it is usually considered polite for the 11 in the group to 12 when a woman enters the room and continue to stand until she is seated. 13 , most young people and some groups of elder people 14 stress equality of the sexes no longer observe the custom. A visitor should be 15 to each situation and follow the lead of the Americans present. When the guests sit down at a dinner table, it is a 16 for the men to help the ladies by pushing their chairs under them. However, some Americans 17 do this, so the visitors must notice what others do and do the 18 . 19 the meal is under way and if the dinner is in a private home, a guest 20 avoid embarrassment by leaving talk to someone else. | |||
| ( )1. A. polite ( )2. A. tells ( )3. A. at most ( )4. A. in case ( )5. A. tender ( )6. A. angry ( )7. A. If ( )8. A. at ( )9. A. Looking at ( )10. A. matter ( )11. A. host ( )12. A. smile ( )13. A. As a result ( )14. A. whose ( )15. A. aware ( )16. A. custom ( )17. A. even ( )18. A. following ( )19. A. Unless ( )20. A. shouldn't | B. elegant B. expects B. less than B. as long as B. nutritious B. nervous B. Unless B. in B. Combined with B. heart B. men B. stand B. Moreover B. what B. similar B. regulation B. no longer B. same B. Until B. must | C. honored C. asks C. at least C. so that C. good C. shameful C. Whether C. on C. Depending on C. sense C. hostess C. applaud C. In addition C. who C. active C. habit C. still C. deed C. While C. needn't | D. serious D. hopes D. more than D. on condition that D. enough D. disappointed D. Although D. about D. Related to D. sign D. women D. nod D. However D. which D. sensitive D. principle D. no more D. example D. After D. may |