The Sun's atmosphere only exists in the first three zones.

A . dew point temperature B . condensation temperature C . psychometric temperature D . absolute humidity temperature

A . anticyclone B . cold front C . occluded front D . cyclone

A . composes of B . is made up C . consists of D . makesup of

A . inlet valves B . exhaust valves C . emergency valves D . run-return valve

A . Isothermal B . Millibars C . Isobars D . Seismic

A . isothermal B . millibars C . isobars D . seismic

A . heavy rain B . gusty winds with rain C . nearly calm，clear nights or early morning D . full sun with high wind

A . vaporizes B . attacks caustically C . rises D . attacks corrosively

W: Maybe you're missing the point of this physics study group. Q: What does the woman mean？ (19) A．She holds the same view with the man. B．The man missed the last study session. C．She didn't understand the last chemistry class. D．The man should be more serious about his studies.

Two of them are【C2】______while the other six【C3】______from the sun than the earth is. The farther they are, the longer【C4】______they【C5】______around the sun. People noticed long ago that these traveling bodies moved around in the sky【C6】______definite paths. It is a【C7】______called gravity that【C8】______them in their paths. We know that every little bit of matter in the【C9】______pulls upon every other bit of mater. The pull between two bodies is【C10】______to the product of their masses. Because the sun is so large that pulls【C11】______the sun and the planets are thus great. If it【C12】______not for these pulls, the planets【C13】______off into space. In the same way【C14】______exists a pull between the earth and the moon, which keeps the moon【C15】______in its orbit around our planet, the earth. The gravity holds you to its surface, and pulls back to it the ball which you【C16】______into the air. Of course the ball also pulls【C17】______the larger earth, but the earth is so much larger that the pull【C18】______. Now remember that large bodies exert a greater pull on any body than smaller ones which contain【C19】______material. But each object in the universe, no matter how small, pulls on all other objects【C20】______extent. 【C1】 A．thing B．body C．matter D．substance

A．as it is B．the same is C．so is D．and equally is

A．minerals B．substances C．gases D．beams

A．我喜欢这的工作气氛 B．我喜欢这里发挥作用的空气 C．我喜欢这里的工作环境

A、met B、heard C、witnessed (见证)

A．absorbed by the clouds in the lower atmosphere B．reflected by the gases in the upper atmosphere C．lost in the upper and lower atmosphere D．used to evaporate water from the oceans and lakes

A．man can get heat from things like wood, coal and oil B．man cannot get the heat directly from the sun C．only wood, coal and oil have heat D．all the sun's heat is trapped in things

The key greenhouse gases emitted by human activities remain in the atmosphere for_______(几十年到几百年的时间)．

A．rain B．teal C．water D．light

对 错