某报刊刊登的“七一”赞歌中写道：“一声惊雷震九天，南湖八十六年前，唤起工农千百万

已知有机物 A、B、C、D、E、F之间的转化关系如图所示。D 是常用做汽车发动机的抗冻剂，E为聚合物，F的式量为26。根据信息回答下列问题。

（1）写出A中官能团名称____________________________

（2）B转化为C的反应类型_______________________

（3）有机物D具有以下哪几方面的化学性质：__________________ （填序号）

① 加成反应 ② 取代反应 ③ 消去反应 ④ 氧化反应 ⑤ 还原反应

（4）E的结构简式为_______________

（5）C-F反应的方程式________________________

民用建筑低温热水地板辐射供暖供、回水温度的一般要求是供水温度不应超过60℃，供、回水温差宜( )10℃。

A．小于
B．小于等于
C．大于
D．等于

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never-ending flood of words.
In (36) a job or advancing in one, the ability to read and comprehend (37) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (38) readers.
Most of us develop poor reading (39) at an early age, and never get over them. The main deficiency (40) in the actual stuff of language itself—words. Taken individually, words have (41) meaning until they are strung together into phrases, sentences and para-graphs. (42) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (43) words or passages.
Regression, the tendency to look back over (44) you have just read, is a common bad habit in reading. Another habit which (45) down the speed of reading is vocalization—sounding each word either orally or mentally as (46) reads. To overcome these bad habits, some reading clinics use a device called an (47) , which moves a bar (or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (48) the reader finds comfortable, in order to "stretch" him.
The accelerator forces the reader to read fast, (49) word-by-word reading, regression and sub vocalization, practically impossible. At first (50) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (51) your comprehension will improve.
Many people have found (52) reading skill drastically improved after some training. (53) Charlce Au, a business manager, for instance, his reading rate was a reasonably good 172 words a minute (54) the training, now it is an excellent 1,378 words a minute. He is delighted that how he can (55) a lot more reading material in a short period of time.

[A] accelerator [B] actor[C] amplifier [D] observer

以“教师”、“教材”、“课堂”为中心的教学是传统教学论流派。

以下关于出售邮资凭证的表述正确的有（）。

A、已经售出的邮票可以从邮局窗口兑换现金

B、已经售出的邮资信封可以从邮局窗口兑换现金

C、已经售出的邮资明信片不可以兑换现金

D、已经售出的邮资邮简不可以兑换现金