请在（47）处填上最佳答案。
（47）最佳答案。
【题目描述】
第 22 题
A、答案的先后顺序
B、答案的表达方式
C、答案的穷尽性
D、答案的互斥性
封闭式问卷答案设计的类别有()。
A、自由回答
B、定类性问题的答案设计
C、定序性问题的答案设计
D、定距性问题的答案设计
E、定量问题的答案设计
20届高二下期期中考试英语试题答案阅读答案： (A) 1-3 BDA (B) 4-7 BABC (C) 8-11 CBAC(D) 12-15 DCDC (E) 16-20 BGAED完形填空答案；21-25 CDBCA 26-30 BDCAB31-35 DCBAA 36-40 CDABD语法填空答案：41. are listed 42. actually 43. which/that 44. to 45. its 46. to learn 47. the 48. pronunciation 49. Published 50. bought短文改错：Read online has become a hot topic of discussion in my class. Different Readingstudents held different opinions. Those who like reading online say it is very holdmuch easier than carrying heavy books around. Also, the cost of printed books are so high these days. But much of the materials online is free and is material very easy to finding. Others say that reading online is bad for our eyes and is find sure to cause you problems. When we read on a screen, we are looking at a us light, what may hurt our eyes. In my opinion, reading online is good thing which aas long as we remember not to spend too long in it. on参考范文：DearDavid, ImwritingtoinviteyoutoattendatraditionalChinesepaintingshowtobeheld inourschoolnextSaturday. The show will begin at 3 pm. and last about three hours. The show is designed to ensure that students are well aware of the traditionalChinesepainting and develop their love for traditional culture. At first,alltheworkscreatedbytheartstudentsandteachers willbeondisplay.After that,therewillbeanartshowlecture made by a famous professor. YouwillalsolearnsometraditionalChinesepaintingskills. Iamsureyouwillbeinterestedinit. Itwouldbea greatpleasuretohaveyouattendthisevent. Iamlookingforwardtoyourreply. Yours, Li Hua
党员有权阅读所有党内文件。( )
参考答案：错误
47～49 题共用以下备选答案。
第 47 题 国家对麻醉药品实行定点（ ）
用重量法测定铁试样0.1600g中的铁,获得0.1300gFe2O3.试样中Fe%的计算式为:( )
A.0.1300答案：×2Fe/Fe2O3答案：×100/0.1600
B.0.1300答案：×Fe2O3/2Fe答案：×100/0.1600
C.0.1300答案：×Fe/Fe2O3答案：×100/0.1600.
D.0.1300答案：×Fe/2000答案：×100/0.1600.
E.0.1300答案：×Fe/1000答案：×100/0.1600
请在（47）处填上最佳答案
"The ability to sleep in one chunk overnight goes down as we age but the amount of sleep we need to 52. well does not change," Dr Drummond told the American Association for the Advancement of Science conference in San Diego.
52.function
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