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[主观题]

____air is invisible, air takes up space.

A. It is

B. Even though

C. That is

D. As yet

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更多“____air is invisible, air take…”相关的问题

第1题

Considered as a continuous body of fluid, the atmosphere is another kind of ocean. Yet, in

view of the total amount of rain and snow on land areas in the course of a year, one of the most amazing water facts is the very small amount of water in the atmosphere at any given time. The volume of the lower seven miles of the atmosphere--the realm of weather events- is roughly four times the volume of the world's oceans. But the atmosphere contains very little water. It is chiefly in the form. of invisible vapor, some of which is carried over land by air currents. If all vapor suddenly fell from the air onto the earth's surface, it would form. a layer only about one inch thick. A heavy rainstorm on a given area may use up only a small percentage of the water from the air mass that passes over. How, then, can some land areas receive more than 400 inches of rain per year？ How can several inches of rain fall during a single storm in a few minutes or hours？ The answer is that rain yielding air masses are in motion, and as the driving air mass moves on, new moist air takes its place.

The basic source of most water vapor is the ocean, evaporation, vapor transport, and precipitation (陈雨) make up the continuous movement of water from ocean to atmosphere to land and back to the sea. Rivers return water the sea. In an underground arc (弧) of the cycle, flowing bodies of water discharge some water directly into rivers and some directly to the sea.

What might have been discussed before this passage？

A．The ocean.

B．The earth.

C．The rainfall.

D．The atmosphere.

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第2题

How is food for plants made？ Food for plants is made ______.A．from waterB．from the air in

How is food for plants made？ Food for plants is made ______.

A．from water

B．from the air in the sky

C．from the soil

D．from water, things in the soil and air and sunlight

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第3题

It was 38 degrees and the air conditioning [barely ]cooled the room.A.simplyB.quicklyC.har

It was 38 degrees and the air conditioning [barely ]cooled the room.

A.simply

B.quickly

C.hardly

D.strongly

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第4题

Air pollution, together with overpopulation, ______ many problems in big cities today.A．ar

Air pollution, together with overpopulation, ______ many problems in big cities today.

A．are causing -

B．is causing

C．are caused

D．is caused

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第5题

A bottle weighs less after air is taken out, ______proves that air has weight.A．weB．itC．wh

A bottle weighs less after air is taken out, ______proves that air has weight.

A．we

B．it

C．which

D．what

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第6题

An air ticket is only （)for the passenger whose name appears on the ticket.A.transferableB

An air ticket is only ()for the passenger whose name appears on the ticket.

A.transferable

B.untransferable

C.valid

D.invalid

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第7题

What is the function of an air receiver in the compressed air system on a ship？A.Condenses

What is the function of an air receiver in the compressed air system on a ship？

A.Condenses moisture

B.Provides overpressure protection

C.Purifies the air

D.Acts as an accumulator

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第8题

邮政物流中包含哪几种物流方式（)A、ePacketB、China Post Air MailC、HongKong Post Air MailD、E

邮政物流中包含哪几种物流方式 ()

A、ePacket

B、China Post Air Mail

C、HongKong Post Air Mail

D、EMS

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第9题

What prevents May, aged 25, becoming an air hostess？A．She once broke a traffic law and was

What prevents May, aged 25, becoming an air hostess？

A．She once broke a traffic law and was fined.

B．She can't speak Japanese very well.

C．She has never before worked as an air hostess.

D．She doesn't feel like working long hours flying abroad.

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第10题

Advection fog may be formed by cold air passing over a ______.A.colder sea surfaceB.warmer

Advection fog may be formed by cold air passing over a ______.

A.colder sea surface

B.warmer sea surface

C.dry coastal plains

D.high mountain or plateau

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