Exposure to the Sun can accelerate the ageing process.A:step up B:decrease C:stop D:control

We can use energy from the sun because ______.

23．The moon is bright because__________

A． there is some fire 'on it

B． it is near the sun，too

C． there is big mirror on it

D． it can get light from the sun

Developing the project schedule is often an iterative process. It determines the planned start and finish dates for project activities and milestones. Schedule development can require the review and revision of duration estimates and resource estimates to create an approved project schedule that can serve as a baseline to(75) progress.

A．analyze

B．track

C．level

D．extend

Evidence from the economists and the building industries shows that ______.

A) exposure to asbestos fibres is cancer-causing

B) asbestos is in extensive use in building industry

C) use of asbestos is being reduced gradually

D) exposure to asbestos fibres can be reduced significantly

Which of the following is true about the motion of the moon?

[A] The moon and the sun are moving in the same plane.

[B] The moon revolved along the ecliptic.

[C] The moon moves faster than the sun.

[D] The position of the moon can be found changed in an hour's time.

A

When you look at the sky at night，the moon looks bigger than the stars． In fact，the moon is much smaller than the stars．It is much smaller than the earth． But the moon is much closer to us than any star． That is why it looks so big． If you hold a coin close．to your eye，it looks big．If you look at it across the room，it looks small．The moon moves around the earth． It makes one trip in about four weeks． The moon looks flat(扁的)to us． But it is a round ball，like the earth．People once thought the moon had fire(火) on it． They thought the fire made it bright．Now we know the moon is like a mirror( 镜子 )． It gets its light from the sun Our sunlight comes from the sun，too: What is the sun? The sun is star． The stars we can see have their own light． There are many big stars we can-t see． Their light has burned out． Others are still bright，but they are so far away that we can-t see them． The sun looks bigger and much brighter than other stars because it is the nearest of all stars． The sun and the other stars we see are very hot，but the air around us saves us from(使------免于) the heat(热量) of the sun．The sun gives us light and warmth．It makes plants grow and leaves turn green． It makes life possible on our earth．It is a life-giving star．

( )21． The moon looks bigger because__________ ．

A． some stars are smaller than it

B．it is between the sun and the earth

C．it is the closest to the earth

D．it is very bright

24． The passage tells us __________．

A． the sun is not the biggest star

B． the sun is bigger than any other star

C． only the sun can shine

D． the sun is one of the farthest stars from us

●Developing the project schedule is often an iterative process. It determines the planned start and finish dates for project activities and milestones. Schedule development can require the review and revision of duration estimates and resource estimates to create an approved project schedule that can serve as a baseline to （75） progress.

（75）

A. analyze

B. track

C. level

D. extend

A.a

B.an

C.The

The smallest size of flaw that can be detected on a radiograph examination of a weld will be indicated by the ______.

A.film speed

B.penetrometer

C.exposure reading

D.time of exposure