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目前世界杯的赛制规定参赛队伍为多少支？

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孟姜女是哪个朝代的人？

某施工单位承揽了一项水利工程的总承包工程，在施工过程中发生了如下事件：
事件1：施工单位与某材料供应商所签订的材料供应合同中未明确材料的供应时间。急需材料时，施工单位要求材料供应商马上将所需材料运抵施工现场，遭到材料供应商的拒绝，两天后才将材料运到施工现场。
事件2：某设备供应商由于进行设备调试，超过合同约定的期限交付施工单位订购的设备，恰好此时该设备的价格下降，施工单位按下降后的价格支付给设备供应商，设备供应商要求以原价执行，双方产生争执。
事件3：施工单位与某施工机械租赁公司签订的租赁合同约定的期限已到，施工单位将租赁的机械交还租赁公司并交付租赁费，此时，双方签订的合同终止。
事件4：该施工单位与某分包单位所签订的合同申明确规定要降低分包工程的质量，从而减少分包单位的合同价格，为施工单位创造更高的利润。
问题
1．你认为事件1中材料供应商的做法是否正确？为什么？
2．根据事件1，你认为合同当事人在约定合同内容时要包括哪些方面的条款？
3．你认为事件2中施工单位的做法是否正确？为什么？
4．事件3中合同终止的原因是什么？除此之外还有什么情况可以使合同的权利义务终止？
5．事件4中的合同当事人签订的合同是否有效？
6．在什么情况下可导致合同无效？

文成公主远嫁吐蕃实在唐朝哪个皇帝在位期间？

Earthquake
1 Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world. Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.
2 There are about a million quakes a year. Fortunately, however, not all of them are destructive. The intensity of an earthquake is measured on the Richter Scale, which goes from 0 upward. The highest scale recorded to date is 8.9. Major damage generally occurs from quakes ranging upwards from 6.0.
3 The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.
4 In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction. Special instruments are used to help people record, for example, shaking of the earth. Scientists are trying to find methods that will enable them to indicate the exact time, location and size of an earthquake.
5 Certain phenomena have been observed which are believed to be the signs of imminent earthquakes. These include strange behaviours of some animals, the changes in the content of mineral water, etc. The magnetic properties of rocks may also display special pattern before major earthquakes happen.
A Earthquake's Forecast
B Historical Records of Earthquakes
C Intensities of Earthquakes
D Cause of Earthquakes
E Indications of Earthquakes
F Damaging Earthquakes
Paragraph 2 ______ .