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在大会上许多专家呼吁政府制订一项全国人口计划以避免土地和水源的进一步污染。

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Due to soil erosion, people living in the forest regions have to migrate annually in order

With the forests cut down, soil can easily lose its fertility when the essential nutrients

It is necessary for a newcomer to ______ of the city since some local people also use maps

They are superstitions attached to numbers; even those ancient Greeks
believed that all numbers and their multiple have some mystical significance. 【M1】
Those numbers between 1 and 13 were on particular to have a powerful 【M2】
influence over the affairs of men.
For example, it is commonly said that luck, good or bad, comes in threes;
if an accident happens, two more of the same kind may be expected soon
shortly afterwards. The arrival of a letter will be followed by two others 【M3】
within a certain period.
Another belief involving the number three has that it is unlucky to light 【M4】
three cigarettes from the one match. If this happens, the bad luck that goes
with the deed falls upon the person which cigarette was the last to be lit. 【M5】
the ill-omen linked to the lighting of three things from one match or candle
goes to at least the 17(上标)century and probably earlier It was believed that 【M6】
three candles alight at the same time would be sum to bring good luck; 【M7】
one, two, or four, were permissible, and never just three. 【M8】
Seven was another significant number, usually regarded as a
bringer of good luck. The ancient astrologers believed that the universe
was governed by seven planets; students of Shakespeare will recall that
life of man was divided into seven ages. Seven horseshoes nailed to
a house will protect it away all evils. Nine is usually thought of as 【M9】
a lucky number because it is the product of three time three. It was 【M10】
much used by the Anglo Saxons in their charms for healing.
【M1】