对标定氧化锆分析器用标准气有何要求？
题型：问答题 简答题
问题：
对标定氧化锆分析器用标准气有何要求？
题型：问答题 简答题
IV.完形填空（共10小题，每小题2分，满分20分）
Tom and Fred were talking about the year 2050.“What will __21___ be like in the year 2050 ?” asked Tom . “I don’t know ,” said Fred . “What do you think ?” “Well , no one knows . But it is ___22___ to guess ,” said Tom . “In the year 2050 everybody will ___23___ a pocket computer.The computer will give people the __24___ to all their problems . We shall all have telephones in our pockets , ___25___ . And we’ll be able to talk to our friends all over the world . Perhaps we’ll be able to __26___ them at the same time . Machines will do ___27___ work , and people will have more ____28____ , perhaps they will work only two or three days a week . They will be able to fly t
o the moon by spaceship and spend their holidays there .”
“I’m very ___29___ to hear that . I hope to fly to the moon . And I hope I’ll be able to live ___30___ ,” said Fred . “Won’t that be interesting ? Just like a fish .”
21. A.our home B.the traffic C.a factory D.the world
22. A.pleased B.no use C.interesting D.unusual
23. A.carry B.bring C.give D.send
24. A.news B.ways C.things D.answers
25. A.either B.again C.too D.also
26. A.call B.see C.look D.listen
27. A.more B.many C.lot D.every
28. A.work B.duty C.holidays D.times
29. A.sorry B.glad C.sure D.afraid
30. A.in the sea B.on land C.on the mountain D.under the ground