题目内容

任何一个矩阵都可以利用初等行变换化为行阶梯形吗?

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"They are very informal and relaxed, unlike their publicpersona, and mostly they leave me alone." The underlined word means.

A. image
B. appearance
C. people

"In the recent years of economic boom, the crows have quietlyamassedgreat power." The underlined word means.

A. accelerate
B. access
C. accumulate

"In their formal speech they are asmeasuredand clear as a radio announcer from the Midwest..." The meaning of the underlined word is.

A. carefully consideredB、
B. seriously judged
C. carefully tested

"Whether they’re good-naturedly harassing an owl caught out in daylight, or carrying bits of sticks and used gauze bandage in their beaks to make their colorful, free-form nests, or simply landing on the sidewalk in front of you with their characteristic double hop, the crows have become a part of thefabricof our days." Fabric in this sentence means.

A. basic material
B. basic building
C. basic way of life

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