矿井涌水量每月观测次数一般为（）次。A、1 B、2 C、1～3

“大跃进”的开展对乡镇企业兴起的背景叙述正确的是                               

①人民公社掀起了农村工业化运动②家庭联产承包责任制的实行，农业生产得到大发展

③农村开始富裕起来④农业生产向专业化、商品化、社会化发展  [ ]

A．①②③④

B．②④  

C．②③④  

D．①③④

Reading comprehension.

     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 groups 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."

1. The underlined word "them" in Paragraph l refers to _____. [ ]

A. thoughts

B. minds

C. people

D. feelings

2. In the experiment, volunteers doing meditation for longer hours _____. [ ]

A. usually ignored the first number observed

B. were used to memorizing numbers in groups

C. were more likely to catch both of the numbers

D. paid more attention to numbers than to letters

3. What can we infer from the passage?[ ]

A. Mediators are given less pressure.

B. Mediators can manage their daily tasks better.

C. Mediators can play the piano better.

D. Mediators are good at using numbers.

4. What can be concluded from the passage? [ ]

A. Meditation improves one's health.

B. Mediators have a good sense of hearing.

C. Brain activity can be recorded.

D. Human attention can be trained.

不读笛卡尔，就不能真正的搞懂什么概念（）

A、几何

B、思考

C、推理

D、演绎

在某工程网络计划中，工作M的最早开始时间和最迟开始时间分别为第15天和第18天，其持续时间为7天，工作M有2项紧后工作，它们的最早开始时间分别为第24天和第26天，则工作M的总时差和自由时差( )天。

A．分别为4和3
B．均为3
C．分别为3和2
D．均为2

同一区域有两台以上设备运行可能发生碰撞时，水利水电施工企业应制定相应的安全措施。