搜题请搜索小程序“爱下问搜题”
问题 单项选择题

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（3分）中国珠算是以算盘为工具进行数字计算的一种方法，借助算盘和口诀，通过人手指拨动算珠，就可以完成高难度计算。_____，_____，_____，______，_____，_____。2013年12月4日，“中国珠算”被正式列入联合国教科文组织人类非物质文化遗产名录。①即便是不识字的人也能熟练掌握②珠算算盘结构简单，操作方便③包含了珠算的所有秘密④蕴含了坐标几何的原理⑤用珠算运算，无论速度还是准确率都可以跟电子计算器媲美⑥珠算口诀则是一套完整的韵味诗歌

A．②③⑥④⑤①

B．②④⑥③①⑤

C．⑤①②⑥③④

D．⑤②③⑥④①

答案

参考答案：B

解析：【试题解析】从前文的句子“借助算盘和口诀”可看出，下文应是对“算盘”和“口诀”的对应解释，②④主要说明算盘的结构及原理，⑥③①是对“珠算口诀”的解释，⑤是算盘和口诀融合运算的效果，放在最后。故答案选B。

填空题

阅读短文，用括号内所给词的正确形式填空。

     Two men, Mr Smith and Mr Martin 1 _______ (be) both badly ill. They were in the same hospital room.

Mr Smith was able to 2 _______ (sit) up in his bed for an hour each afternoon. His bed was next to the only

window of the room. Mr Martin had to spend all his time  3 _______ (lie) on his back. The men talked for

hours without 4 _______ (stop). They spoke of their families, their times, their jobs... And every afternoon

when Mr Smith could sit up in his bed, he 5 _______ (will) pass the time by 6 _______ (talk )to his roommate

about all the things that he could see outside the window. Mr Martin believed that his world 7 _______ (make )

 "larger" by the "colorful" outside world.

1._____ 2._____ 3._____ 4._____ 5._____ 6._____ 7._____
查看答案
单项选择题

如图所示，一玻璃棱镜的横截面是等腰△abc，其中ac面是镀银的。现有一光线垂直于ab面入射，在棱镜内经过两次反射后垂直于bc面射出。则（）

A、∠a=30°，∠b=75°

B、∠a=34°，∠b=73°

C、∠a=32°，∠b=74°

D、∠a=36°，∠b=72°
查看答案