从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性：().  A.

Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much. In comparison with the total number of earthquakes each year, the number of disastrous earthquakes is very small.[JP]

The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an erect set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to be recorded on distant instruments, but it completely destroyed the city. Many stronger earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.

The United Nations has played an important part in reducing the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area. If followed, these suggestions will make disastrous earthquakes almost a thing of the past.

There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic sea waves, or tsunamis. (These are often called tidal waves, but the name is incorrect. They have nothing to do with tides.)

In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them “tsunamis”, meaning “harbor waves”, because they reach a sizable height only in harbors.

Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An adequate warning system is in use to warn all shores likely to be reached by the waves.

But this only enables people to leave the threatened shores for higher ground. There is no way to stop the oncoming wave.

65. Which of the following CANNOT be concluded from the passage?

A. The number of earthquakes is closely related to depth.

B. Roughly the same number of earthquakes occur each year.、

C. Earthquakes are impossible at depths over 460 miles.

D. Earthquakes are most likely to occur near the surfaces.

66. The destruction of Agadir is an example of_____.

A. faulty building construction                        B. an earthquake’s strength

C. widespread panic in earthquakes                  D. ineffective instruments

67. The United Nations’ experts are supposed to_____.

A. construct strong buildings                          B. put forward proposals

C. detect disastrous earthquakes                D. monitor earthquakes

68. The significance of the slow speed of tsunamis is that people may_____.

A. notice them out at sea                                B. find ways to stop them

C. be warned early enough                      D. develop warning systems

为什么说中共十一届三中全会是建国以来党的历史上的伟大转折？

______________________________________________________________________________

毛 * * 思想达到成熟的标志是( )。

A．以农村包围城市的革命理论的形成

B．社会主义革命和建设理论的形成

C．实事求是思想路线的形成

D．新民主主义理论科学体系的形成

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某机电安装工程公司承担了某区大型企业的电气线路安装任务。业主要求电气线路施工前的技术准备内容包括：图纸会审，编制工程预算，编制电气专业的计划，开工前进行技术交底等。工程还包括对旁边的35 kV以下架，空电力线路进行安装。经业主同意，整个电气线路安装任务开始。

导线连接要牢固，导电良好。穿线工序为：清扫管路→穿引线钢丝→放线→（）→管内穿线→做接线头。

A．引线与导线结扎

B．相线与导线结扎

C．拉线安装

D．导线的连接