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Basic research provides the capital fund of scientific knowledge, on which the applied re searchers draw to give society a rich rate of interest.（）
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June 15, 2007Dear Sir,Your shipment of twelve thousand "Smart" watches was received by our company this morning. However, we wish to make a number of complaints concerning the serious delay in delivery and your failure to carry out our instructions with regard to this order.Late delivery of the goods has caused us to disappoint several of our most valued customers.The second complaint concerns the mismatch in color between the watches we ordered and those delivered.As a result of the above problems, therefore, we feel that the most suitable course of action is to return to you unpaid any of the goods considered unsatisfactory. We look forward to your prompt reply.Yours sincerely,Marks SwiftManaging Director,Johnson & Sons Ltd.There are (1) "Smart" watched in the shipment.This letter of complaint concerns the serious (2) and the mismatch (3) .Later delivery caused the disappointment of several (4) .Those watches will be returned to the seller (5) . 3（）
The high cost of urban transportation has invariably fallen most heavilyon the poorest classes, who pay a higher proportion of family income to 62.______transportation, and often cannot find adequate means of reachingemployment. In modern industrial centers new jobs tend to locate away from 63.______file congested districts where the poor traditionally live.Normally walking speed for a man has remained at about 3.1 miles perhour at the beginning of recorded history. Horses and horse-drawn omnibuses 64.______raised the speed of travel to approximately 6 miles per hour. Buses andtrolleys providing average speeds of 5 to 6 miles per hour in rush-hour traffic 65.______to 12-14 miles per hour on most city streets in other time periods. Speed ofup to 50 miles per hour are often reached by buses in outlying streets of largecities, but schedule speeds, which include stopping times, are much higher. 66.______Studies of relative speeds of principle mid 20th-century urban-transitmodes showed average automobile speeds of up to 10 miles per hour,compare with 16 miles per hour for suburban rail roads, and substantially less 67.______for other mass transit. When doubtless valid statistically, such studies are 68.______misleading because of the different functions of the different types of transitTo gain a real picture of urban transit speeds in a city like Paris or New Yorkwould require a rationale that included a number of persons moved per mile, 69.______how near the center of the city the movement took place, and aim stationspacing. Broadly speaking, what may be said that while speed of movement, 70.______especially during rush hours, still leaves something to be desired in mostcities, it is as critical a problem as that of costs. 71.______ 66（）
Never have I seen (beautiful) （） scenery than this.
材料的脆性是指材料在冲击或振动荷载作用下产生较大变形尚不致破坏的性质，如钢材、木材等。( )
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