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单选题
A farmer imported several fine long wool Tomney sheep from Australia to breed with his Debouittet sheep in hopes of increasing the value of the flock’s wool. This is an example of ______.
A
pure-breeding
B
crossbreeding
C
reproducing
D
cloning
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参考解析
解析：
题干中描述到一位农民从澳大利亚进口了几只拥有优良长毛的Tomney sheep，然后让它们与他的Debouittet sheep进行繁殖，希望来增加羊群的羊毛价值，根据上题解析可知这属于crossbreeding（杂交）。
题干中描述到一位农民从澳大利亚进口了几只拥有优良长毛的Tomney sheep，然后让它们与他的Debouittet sheep进行繁殖，希望来增加羊群的羊毛价值，根据上题解析可知这属于crossbreeding（杂交）。
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His example（）that everyone can become a useful person in society so long as he is willing to work hard.AexpressesBthinksCindicatesDsupplies
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gentlyB
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She was manufactured out of the lab.C
She was cloned from the cell of a mature sheep.D
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考题
单选题The text is probably written as ______.A
a report of scientific progress to the general public.B
an academic discussion of new possibilities in genetic science.C
an argument for using pigs over sheep as transplant materials.D
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advantageB
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charge
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the extra revenue produced by increasing the price of a serviceB
the annual cost of maintaining a municipal recycling programC
the value of a beaver pelt in the wholesale marketD
the irritating noise caused by a neighbor's motorcycleE
the salaries paid to environmental workers
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单选题Why has Australia always been a continent with few people?（）A
Because Australia is too far away from Europe.B
Because Australia is the least mountainous and most level of the world.s continents.C
Because Australia is separated from the rest of the world by seas.D
Because most of the continent is hot and dry.
考题
单选题His example（）that everyone can become a useful person in society so long as he is willing to work hard.A
expressesB
thinksC
indicatesD
supplies
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