题目内容
（请给出正确答案）
A．blank
B．hollow
C．vacant
D．bare
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（由简答题聘请的专业题库老师提供的解答）
更多“Although they plant trees in this area every year, the tops of some hills are still ______”相关的问题
A.As they are young
B.Young as they are
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Although they plant trees in this area every year, ______________________(山顶仍然是光秃秃的).
A．bare
B．empty
C．blank
D．vacant
Businessman David Waiters finds that______.
A．his plant still is run well despite the economic slowdown
B．salesmen at his plant adapt themselves psychologically to tile change
C．workers at his plant are more willing to work harder
D．his plant is still hiring people although there is a shortage of competent workers
A．blank
B．hollow
C．vacant
D．bare
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B、vehicles
C、airliners
D、instruments
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Thomas Malthus published his Essay on the Principle of Population
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that worldwide famine was just around the next comer. The fast-growing
population's demand for food, they warned, would soon exceed their 【M2】 ______
supply, leading to widespread food shortages and starvation.
But in reality, the world's total grain harvest has risen steadily over the
years. Except for relative isolated trouble spots like present-day Somalia, 【M3】 ______
and occasional years of good harvests, the world's food crisis has remained 【M4】 ______
just around the comer. Most experts believe this can continue even as ff 【M5】 ______
the population doubles by the mid-21st century, although feeding l0 billion
people will not be easy for politics, economic and environmental reasons. 【M6】 ______
Optimists point to concrete examples of continued improvements in yield.
In Africa, by instance, improved seeds, more fertilizers and advanced 【M7】 ______
growing practices have more than double com and wheat yields in an 【M8】 ______
experiment. Elsewhere, rice experts in the Philippines are producing
a plant with few stems and more seeds. There is no guarantee that plant 【M9】 ______
breeders can continue to develop new, higher-yielding crop, but most 【M10】______
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【M1】
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