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  3. British Columbia has greater variations in climate than any other province in Canada. When warm winds from the west hit the cold

British Columbia has greater variations in climate than any other province in Canada. When warm winds from the west hit the cold

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问题 British Columbia has greater variations in climate than any other province in Canada. When warm winds from the west hit the cold【C1】______ of the many mountain ranges, the result is heavy rainfall. Inland plateaus, however, are largely【C2】______ On the lower coast, the temperature is mild, with little【C3】______ any snow. In the northern belt, temperatures range from 50° below zero to 90° above zero. This area has more rain and snow. The forests of British Columbia【C4】______ about one hundred million acres. The【C5】______ of many mountain ranges are blanketed with【C6】______ . Red cedar(雪松), and hemlock (铁杉) are found in large【C7】______ .
    While lumber is the most important industry for British Columbia, its【C8】______ also supply large revenues, particularly in the southern areas. Cod and salmon are the most abundant【C9】______ of commercial value. There are many kinds of【C10】______ . Goats and sheep axe found in the mountains, and moose and deer in the valleys and woods.【C11】______ this wildlife is a source of food and other valuable products, trap- pets caught and killed large numbers of these animals with no【C12】______ to preserve the supply. As a re- suit, the government has had to regulate trapping and has introduced fur farming. These【C13】______ have been successful. Consequently, the supply of wildlife has been【C14】______ . British Columbia does not【C15】______ only upon its natural resources to provide employment. In Vancouver, many【C16】______ plants employ large numbers of workers. Large industrial plants make【C17】______ and aluminum. Smaller factories turn out a variety of products. In recent years, there has been a marked【C18】______ in livestock (家畜)raising. In addition, poultry(家禽) and eggs. as well as fruits and vegetables, are important products in the【C19】______ areas southeast of Vancouver. Manufactured and agricultural products are【C20】______ by rail to Canada’s eastern regions.
【C11】
选项 A、Since
B、However
C、Ever since
D、if
答案A
解析 本句上下文是因果关系，而however，ever since和if都不能表达这种关系，而since可以表明因果关系，所以选A)
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