题目内容
(view) ______ are now able to watch television for many hours a day, if they have time and inclination.
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(button) It was very warm, so he ______ his coat.
The richest gold and silver mine in Nevada was sold by the owner for $42, 1 , where he thought he could get rich. Professor Agassiz once told the harvard students of a farmer who owned a farm of hundreds of acres of unprofitable woods and rocks, 2 . He decided to go into the coal-oil business; he studied coal measures and coal-oil deposits, 3 . He sold his farm for $ 200, and engaged in his new business two hundred miles away. 4 , the man who bought his farm discovered upon it a great flood of coaloil, 5 . Hundreds of years ago there lived near the shore of the river Indus a Persian by the name of Ali Hafed. He lived in a cottage on the river bank, 6 . He had a wife and children, an extensive farm, fields of grain, gardens of flowers, orchards of fruit, and miles of forest. He had plenty of money and everything that heart could wish. He was contented and happy. One evening a priest of Buddha visited him, and, sitting before the fire, explained to him how the world was made, 7 . A. Only a short time after B. to get money to pay his passage to other mines C. and how the first beams of sunlight condensed on the earth’s surface into diamonds D. which the farmer had previously ignorantly tried to drain off E. from which he could get a grand view of the beautiful country stretching away to the sea F. and concluded to sell out and get into a more profitable business G. and experimented for a long time
(conclude) And we have to draw the same ______ if a language has less than 100 speakers, it is not likely to last very long.
设α1，α2，α3，α4是齐次方程组Ax=0的基础解系，下列解向量组也是方程组Ax=0的基础解系的是______。
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