lvguitao
幼苗
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"It looks like ( a ) drum or ( a ) box flying through ( the ) sky!" "It looks like ( a ) huge balloon!" "It looks like ( the ) moon." These are just ( a ) few of (the ) ways that people have described artificial satellites.For over ( 35 ) years,( the ) former Soviet Union and (the ) United States have been sending satellites into orbit.in recent times,( other ) countries have also been orbiiting (their) satellites,so now
thousands of ( these ) man-made objects,which are of different shapes and sizes,travel around ( the ) earth.Some of ( the ) satellites are not as big as
( a) hand; Other are as tall as ( an) apartment building with ( 12 ) or ( 13 ) storeys.
Why have ( these ) satellites been launched?What have they been doing in space?
Almost all of ( the ) setellites have been sending ( a ) kind of information to stations on earth.But not all of them were designed for ( the )
same jobs.( Some ) satellites send weather information; others transmit scientific information——they explore ( the ) solar system,study ( the ) atmosphere,
and take photograghs of ( the ) planets and ( the ) moon.Satellites also transmit radio signals that direct ships and planes through ( all ) kinds of weather.
括号里的数字是英文数字
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1年前
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