“学问虽远在中国，亦当求之。”这句话是谁的名言[ ] A．阿基米德 B．亚里士多

扑救地铁火灾，要坚持快速反应，集中调集优势兵力于火场，为（）创造必要条件。

A、有效实施遇险人员救助

B、快速扑灭火灾

C、快速进行破拆

D、强攻近战

通常，自然连接的两个运算对象关系R和S具有公共属性，如果关系R和S没有公共属性，那么它们的自然连接就等同于（）。

按照商品房预售的一般流程，王某在签订商品房预售合同后，预售合同须登记备案，这一手续办理方式是( )。

A．王某在签约之日起30日内到有关机关办理

B．王某在签约之日起90日内到有关机关办理

C．该楼盘开发商在签约之日起90日内到有关机关办理

D．该楼盘开发商在签约之日起30日内到有关机关办理

Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.

This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over the next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.

This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.

Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone（臭氧） levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.

“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere.” Scientists tracked the change in the amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicted, 0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.

小题1:According to the new findings, taking steps to prevent northern forest fires may __________.

A．result in a warming climate

B．cause the forest fires to occur more frequently

C．lead to a longer fire season

D．protect the forests and the environment there小题2:The following are all the immediate effects after a forest fire EXCEPT __________.

A．large amounts of greenhouse gases enter the atmosphere

B．the levels of ozone which is a type of oxygen increase

C．snow on the ground mirrors more sunlight back into space

D．ashes from the fire fall on the ice surface and take in more radiation from the sun小题3:Earlier studies about northern forest fires __________.

A．analyze all aspects of how northern fires influence climate

B．indicate that forest fires will pollute the atmosphere

C．suggest that people should take measures to protect environment

D．suggest that the fires will speed up climate warming小题4:The underlined phrase “soak up” in the last paragraph most probably means __________.

A．released

B．absorbed

C．created

D．distributed小题5:From the passage we can draw a conclusion that forest fires in Alaska, Canada and Siberia may __________.

A．warm the climate as the supposition goes

B．allow more snow to reflect more sunlight into space and thus cool the climate

C．destroy large areas of forests and pollute the far-off sea ice

D．help to gain more energy rather than release more energy

从所给的四个选项中，选择最合适的一个填在问号处，使之呈现一定的规律性（）

A.选项A

B.选项B

C.选项C

D.选项D