几道摸考题，请帮忙！谢谢

menghongtao

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

dreadpower

     1。虚拟语气，排除A，B。economic排除后省下D


        2。B中的a plant似乎不很合适，they也不合适


         3。看不懂


         4。A，B中providing 的逻辑主语错


                             C中the Holstein cow 特指，意思不对

dreadpower

     这是什么的摸考题目？？

ecsniffer

这几题模考题看起来很不爽~~

sbbi

也许是真题哦.

ecsniffer     mm,我喜欢你的新面貌!+U