I was really surprised to find out that the first public showings of wireless TV transmissions took 41 way back in 1925. It took another three years before there was any regular public broadcasting. 4 题目和参考答案——青夏教育精英家教网—

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Another drug that has helped increase the standard of people’s 41 is penicillin. This bacteria-killing medicine is considered by many to be one of the most 42 medicines in contemporary society. It was discovered by 43 Scottish scientist named Alexander Fleming in 1928. He noted that mould had grown on a special transparent jelly that had bacteria on it. Fleming tried this mould 44 on another bacterium and found that it killed the bacteriun 45 . He named the chemical found in the mould ‘penicillin’ and tried to make it pure to be a medicine.

46 , it was not until World War Ⅱ 47 two other scientists managed to use new chemical techniques to purify it. They were able to produce it in large 48 .

(湘郡生试题) I was really surprised to find out that the first public showings of wireless TV transmissions took 41 way back in 1925. It took another three years before there was any regular public broadcasting. 42 , I think people must have found 43 quite a delight when color TV was first broadcast in 1929. 44 , within the next 65 years, people would be able to choose 45 to watch from a 46 of 200 different channels because 47 cable TV. It is reported 48 in 1998, 66 percent of households in the USA had cable TV.

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