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【单选题】
In our society, we must communicate with other people. A great deal of communicating is performed on a person-to person【C1】______ by the simple means of speech. If we travel in buses, stand in football match【C2】______ , we are likely to have conversation【C3】______ we give information or opinions, and sometimes have our views【C4】______ by other members of society. Face-to-face contact is【C5】______ the only form. of communication and during the last two hundred years the【C6】______ of mass communication has become one of the dominating factors of contemporary society. Two things, 【C7】______ others, have caused the enormous growth of the communication industry. Firstly, inventiveness has led to【C8】______ in printing, photography and so on. Secondly, speed has revolutionized the【C9】______ and reception of communications so that local news often takes【C10】______ back beat to national news. No longer is the possession of information【C11】______ to a privileged minority. Forty years ago people used to【C12】______ to the cinema, but now far more people sit at home and turn on the TV to watch a programme that【C13】______ into millions of homes. Communication is no longer merely concerned【C14】______ the transmission of information. The modem communications industry influences the way people live in society and broadens, their【C15】______ by allowing access to information, education and entertainment. The printing, broadcasting and【C16】______ industries are all involved with informing, educating and entertaining. 【C17】______ a great deal of the material communicated by the mass media is very【C18】______ to the individual and to the society of which he is a part, the vast modem network of communications is【C19】______ to abuse. How ever, the mass media are with us for better, for worse, and there is no turning【C20】______ . 【C1】
A.
basis
B.
base
C.
foundation
D.
ground
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【单选题】关于丙二酸二乙酯在有机合机上的应用,叙述不正确的是( )
A.
丙二酸二乙酯亚甲基上的氢在乙醇钠作用下,形成碳负离子,然后与卤代烃反应,生成相应的烃基化产物,后者再经碱性水解、酸化、脱羧,生成取代甲基酮
B.
1mol 丙二酸二乙酯与两种不同卤代烃,可制备二取代乙酸
C.
1mol 丙二酸二乙酯与 1mol 二卤代烃,可制备含环的乙酸
D.
2mol 丙二酸二乙酯与 1mol 二卤代烃,可制备 1 , 5 及 1 , 5 以上的二元羧酸
【判断题】马氏加成的条件是:烯烃是不对称结构,试剂也是不对称结构。
A.
正确
B.
错误
【判断题】建筑物平面图是指用一假想水平剖切面沿室外窗台以下适当高度剖切房屋后所作的水平剖视图。
A.
正确
B.
错误
【简答题】在实际工程中,二氧化碳浓度为()ppm,即是通风换气计算用的上限值。
【判断题】使用“插入表格”按钮的方式适合于创建行、列数较多的表格。
A.
正确
B.
错误
【单选题】下列关于有机化合物的叙述中不 正确的是(  )
A.
正丁烷的熔点、沸点比异丁烷的高
B.
1mol乙酸与乙醇在一定条件下发生酯化反应,可生成1mol乙酸乙酯
C.
CH 2 Cl 2 是纯净物说明甲烷是四面体结构而不是正方形结构
D.
溴水既可鉴别乙烷与乙烯,又可除去乙烷中的乙烯而得到纯净的乙烷
【简答题】生物多样性一般有三个水平,即( )多样性、( )多样性、( )多样性。
【单选题】大脑皮层具有系统性活动的机能,在日常生活中如果一个人比较稳定地从事某一活动,系列的刺激经常按照一定方式前后和强弱作用于有机体,人就能够把这些刺激有规律的协调成为一个条件反射连锁系统,称为( )。
A.
整体定型
B.
连锁反应
C.
动力定型
D.
相互诱导
【单选题】— Can you give me a belier price? — I am sorry. We can't change. ______
A.
the price
B.
a price
C.
price
【单选题】Parents _____ much importance to education. They will do their best to give their children that priceless gift. [      ]
A.
devote
B.
pay
C.
attach
D.
apply
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