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几道摸考题，请帮忙！谢谢
1，To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
b. have to know a great deal more than they do now about the social and economical
c. would have to know a great deal more than they do now about the social and economical
d. would have to know a great deal more than they do now about the social and economic
e. would have to know a great deal more than now about the social and economical
2. The ancient anassazi harvested such native desert vegetation as the purple flowered bee plant, what they now commonly call wild spinach in northern arizona and other parts of the world.
b. a plant that they now aommonly call
c. now commonly called
d. and now is commonly called
3. ...its framwork of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet
a....
b. and banked with dirt as high as that of
c. was banked with dirt as hight as
4.for the famer who takes care to keep cool, providing them with high-energy feed, and milking them regularly , Holsterin cow are producing an averageof 1990 gallons milk per year.
a...
b.providing them with high-energy feed, and milked regularly , the Holsterin cow produces
c.provided with high-energy feed, and milked regularly, the Holstein cow produces
d. provided with high-energy feed, and milked regularly, Holstein cows will produce
answer : 1-4 dcad
请帮我看看，我实在不明白为什么是那些答案，多谢
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发表于 2004-3-5 09:10:00
