离子交换树脂的（）是离子交换树脂可以反复使用的基础。A.可逆性； B.再生性； C.

新民主主义革命是“新式的特殊的资产阶级民主革命”，其基本特点是

A．无产阶级的(通过 * * 党)领导
B．属于世界无产阶级革命范畴
C．以马克思主义为指导思想
D．革命的前途是经由新民主主义逐渐过渡到社会主义

3支圆珠笔与15支铅笔的价格相等，买4支圆珠笔与5支铅笔要付30元，每支铅笔，______元．

计算机系统的性能评价有多种方法，在关于各种性能评价方法的描述中，说法有误的是（）。

A．用MIPS来比较体系结构不同的微处理器的运算速度可能会得出错误的结论

B．CPT方法计算的是每秒百万次理论运算(MTOPS)，因而叫做综合理论性能

C．吉布森(Gibson)混合比例计算法会受到cache命中率和流水线效率的影响而出现测量偏差

D．数据处理速率(PDR)方法测量的是指令执行的平均时间，它可以全面反映网络操作系统的性能指标

第三部分：阅读理解（共10小题；每小题2分，满分20分）

请认真阅读下列短文，从短文后所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

A

In meditation（冥想），people sit quietly and focus their attention on their breath. As they breathe in and out, they attend to their feelings. As thoughts go through their minds, they let them go. Breathe. Let go. Breathe. Let go.

According to a recent study at the Insight Meditation Society in Barre, Massachusetts, three months of training in this kind of meditation causes a marked change in how the brain allocates attention. It appears that the ability to let go thoughts that come into mind frees the brain to attend to more rapidly changing things and events in the outside world. Expert mediators are better than other people at catching such fast-changing stimuli, like facial expressions.

The study provides evidence for changes in the workings of the brain with mental training. People can learn and improve abilities of all sorts with practice, everything from driving to playing the piano. The study has shown that meditation is good for the brain. It appears to reduce pressure and promote a sense of well-being.

In an experiment, 17 volunteers with no meditation experience in the experimental group spent three months meditating 10 to 12 hours a day. A control group also with no meditation experience meditated for 20 minutes a day over the same period. Both groups were then given the tests with two numbers in a group of letters. As both group looked for the numbers, their brain activity was recorded.

Everyone could catch the first number. But the brain recordings showed that the less experienced mediators tended to grasp the first number and hang onto it, so they missed the second number. Those with more experience gave less attention to the first number as if letting it go, which led to an increased ability to grasp the second number. This shows that attention can change with practice.

Just ask Daniel Levision, who meditated for three months as part of the study.” I am a much better listener,” he said. “I do not get lost in my own personal reaction to what people are saying.”

56. The underlined word “them” in Paragraph 1 refers to ________.

A. feelings         B. minds         C. people        D. thoughts

57. Meditations manage their daily tasks better because they ________.

A. are given less pressure                   B. allocate their attention better

C. have more stimuli for life                D. practice them more frequently

58. The study proves that ________.

A. meditation improves one’s health        B. brain activity can be recorded

C. human attention can be trained              D. mediators have a good sense of hearing

滚齿机差动运动，是由滚刀的（）和工件的（）组成。