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1Scientists predict that textbooks of the future will be computerized and will thus offer many of the special benefits unique to computers. 2First of all, they say that the books will take the form of small plastic cards that can be inserted into screens the size of paperback novels. 3Viewers will be able to select the size and style of print and automatic page turning, or they may choose to listen to an audio version and just watch the pictures. 4They will be able to zoom in for close-ups of illustrations, which will then fill the screen and rotate for a three-dimensional view, so that medical students, for example, can see all sides of a muscle and how it moves. 5Finally, viewers will be able to interact with materials by typing in critical comments, updating information, and even changing the outcome of a story.

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1A major study of firstborn children reveals that they tend to be super-achievers who strive very hard to make their families proud. 2 lt was discovered that of the country's first twenty-three astronauts, an amazing twenty-one were firstborn in theirfamilies.3Also, slightlymorethanhalf— 52percent— ofourpresidentswere firstbornchildren. 4 Lesspositiveisthefactthatfirstbornsareunderalotofpressure to succeed, because their families often pin their hopes and dreams on them. 5Also, as the eldest, they are expected to "set an example" for their younger brothersandsisters. 6 Furthermore, these firstborns sometimes have trouble with personal relationshipsbecause theylearnedtobeveryindependentandtoenjoydoingthings ontheirown—sincetheyweretheonlychildrenintheirfamiliesuntiltheiryounger brothersandsisterswereborn.7Theconclusionofthestudyisthatbeingafirstborn child is a mixed blessing, having positive as well as some negativeaspects.

1Baseball enthusiasts hold softball in low esteem. 2 lt's a picnic game, they argue, with a big, soft ball, shorter base paths, and a pitcher who throws underhand. 3Yet fast-pitch softball can be as intense and dramatic as any baseball game, perhaps moreso.4True,thebasepathsareshorter, butaskanythirdbasemanhowquicklyawell-hit groundball reaches him on softball's smaller diamond. 5True, the pitcher throws underhand, but he stands fifteen feet closer to the plate, and he might hit speeds exceeding eighty miles per hour. 6True, the ball is softer than a baseball, but catch a hard one in the ribs just once, and such knowledge is smallcomfort.

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从高频已调信号中恢复出原调制信号的过程的过程称为（）又称为（）。