题目内容
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Agriculture () 20 per cent of the gross domestic product in a country with an agricultural population of around 1 billion.在我国农民人口约十亿，农业占国民生产总值的20%。
A、accounts for
B、accountant for
C、accounts out
D、account for
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更多“Agriculture （) 20 per cent of the gross domestic product in a country with an agricul”相关的问题
Dry farming is a type of agriculture used in areas______less than 20 inches of rainfall．
A.there are
B.where there is
C.in which is
D.which has
seeds and fruits. Not long after the last Ice Age, around 7,000 B.C. (during the Neolithic period),
some hunters and gatherers began to rely chiefly on agriculture for their sustenance. Others
continued the old pastoral and nomadic ways. Indeed, agriculture itself evolved over the courseof
(5) time, and Neolithic peoples had long known how to grow crops. The real transformation of human
life occurred when huge numbers of people began to rely primarily and permanently on the grain
they grew and the animals they domesticated.
Agriculture made possible a more stable and secure life. With it Neolithic peoples flourished,
fashioning an energetic, creative era. They were responsible for many fundamental inventions and
(10) innovations that the modern world takes for granted. First, obviously, is systematic agriculture--
that is, the reliance of Neolithic peoples on agriculture as their primary, not/nerely subsidiary,
source of food.
Thus they developed the primary economic activity of the entire ancient world and the basis of all
modern life. With the settled routine of Neolithic farmers came the evolution of towns and
(15) eventually cities. Neolithic farmers usually raised more food than they could consume, and their
surpluses permitted larger, healthier populations. Population growth in turn created an even
greater reliance on settled farming, as only systematic agriculture could sustain the increased
numbers of people. Since surpluses o food could also be bartered for other commodities, the
Neolithic era witnessed ihe beginnings of large-scale exchange of goods. In time the increasing
(20) complexity of Neolithic societies led to the development of writing, prompted by the need to keep
records and later by the urge to chronicle experiences, learning, and beliefs.
The transition to settled life also had a profound impact on the family. The shared needs and
pressures that encourage extended-family ties are less prominent in settled than in nomadic
societies. Bonds to the extended family weakened. In towns and cities, the nuclear family was
(25) more dependent on its immediate neighbors than on kinfolk.
What does the passage mainly discuss？
A．Why many human societies are dependent on agriculture
B．the changes agriculture brought to human life
C．How Neolithic peoples discovered agriculture
D．Why the first agricultural societies failed
燃气用埋地PE管材适用于工作温度20～40℃、最大工作压力≤0.4MPa的燃气输送。()
A.12、15、16、17、25、22、19、20、21、14、9、PE
B.12、22、25、17、16、15、19、20、21、14、9、PE
C.1、3、5、10、11、12、13、9、PE
D.12、15、16、17、18、19、20、21、14、9、PE
A.Pe=40e=20
B.Pe=70e=1
C.Pe=55e=15
D.Pe=60e=15
A.PE分位点大于50%，PB分位点小于50%
B.PE分位点小于50%，PB分位点小于20%
C.PE分位点小于50%，PB分位点小于50%
D.PE分位点小于20%，PB分位点小于50%
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