In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. British companies have prop

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
British companies have proposed designs that are more suitable than the X-33 and X-34, but the government does not support it.

选项 A、Y
B、N
C、NG

答案A

解析第8段的最后1句，“…but they aye handicapped by a government…”受到了政府部门的阻碍。

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大学英语六级

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In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. British companies have prop

大学英语六级

"Avoidtherush-hour"mustbethesloganoflargecitiesallovertheworld.Whereveryoulook,it’speople,people,people.The

(electric)______intheareahasbeencutoffforthreehoursbecauseofthunderstorm.

Tomsaidinhisletterthathewouldappreciate______fromyouassoonaspossible.

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Whatshouldwedofirstwhenwemakeamistake?Weshouldacknowledgeit______.

Researcherssaypeopletravelingintrafficarethreetimesmorelikelytosufferaheartattack.Theysaytheriskofahearta

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