C Fifty-seven percent of Americans want large portions.
D Forty-five percent of Americans want smaller portions.
40 Which of the following is NOT true of working class Americans?
A They work long hours.
B They live from paycheck to paycheck.
C They dont want to be healthy eaters.
D They want to save money for presents.
第三篇 Sunspots
Its not surprising that sunspots(太阳黑子)were observed by ancient astronomers(天文学家).The largest sunspots on the sun can be seen without a telescope.1t was not until the invention of the telescope(望远镜)in the early l7th century,however,that systematic studies of sunspots could be undertaken.The great astronomer Galileo was among the first to make telescopic observations of sunspots.
Sunspots are regions of extremely strong magnetic fields(磁场)found on the suns surface.A sunspot has a dark central core known as the umbra.The umbra is surrounded by a dark ring called the penumbra.where the magnetic field spreads outward.Sunspots appear dark because they are giving off less radiation.They are cooler than the rest of the suns surface.
Sunspots are frequently observed in pairs or in paired groups.The members of a spot pair are identified as the leading spot and the following spot.They are identified by their position In the pair In terms of the direction in which the sun rotates(旋转).
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