Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.

更新时间:2024-10-30 09:22:37
A、beingcombined
B、havingcombined
C、tocombine
D、combined
正确答案:

A

答案解析:

【句意】 由于铝总是和其它元素结合在一起,最常见的是和氧气在一起,所以自然界中哪里也不会找到单独的铝元素。

【难点】 owing to 是介词,后应接名词或动名词,根据题意,应接被动语态形式。

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California is a land of variety and contrast. Almost every type of physical land feature , sort of arctic ice fields and tropical jungles can be found within its borders. Sharply contrasting types of land often lie very close to one another. People living in Bakersfield , for instance,can visit the Pacific Ocean and the coastal plain , the fertile San Joaquin Valley , the arid Mojave Desert , and the high Sierra Nevada, all within a radius of about 100 miles. In other areas it is possible to go snow skiing in the morning and surfing in the evening of the same day , without having to travel long distance. Contrast abounds in California. The highest point in the United States (outside Alaska ) is in California , and so is the lowest point (including Alaska )。 Mount Whitney , 14,494 feet above sea level,is separated from Death Valley , 282 feet below sea level,by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles. California has deep , clear mountain lakes like Lake Tahoe , the deepest in the country, but it also has shallow, salty desert lakes. It has Lake Tulainyo , 12,020 feet above sea level, and the lowest lake in the country , the Salton Sea, 236 feet below sea level. Some of its lakes , like Owens Lake in Death Valley , are not lakes at all: they are dried up lake beds. In addition to mountains ,lakes, valleys,deserts, and plateaus,California has its Pacific coastline, stretching longer than the coastlines of Oregon and Washington combined.

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D. Owens Lake , in Death Valley , is not really a lake at all.

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