题目

李强小组做了探究玉米种子萌发的环境条件实验，下表是他们的实验结果，请根据表格分析回答问题： 瓶号 种子所处环境 实验结果 ① 不放水，置于25℃橱柜中 种子不萌发 ② 放适量水，置于25℃橱柜中 种子萌发 ③ 放适量水，置于冰箱冰藏室（4℃） 种子不萌发 ④ 将种子全部浸泡在水中，置于25℃橱柜中 种子不萌发 （1） 本实验中，对照组是瓶。 （2） ①③④瓶中种子未萌　　In 1780 James Watt produced art efficient steam engine which powered 40 machines in a Glasgow factory． That date is normally taken as the beginning of the Industrial Age． Since then, industrial development has changed our way of life more and more． The revolution in communications, for example, has made the world seem much smaller． The invention of the telephones in 1876 by another Scotsman, Bell, and Marconi's first radio broadcast 19 years later were both important developments． But the Italian inventor’s early radios seem very primitive compared with modern portable radios． These were made possible by the invention of the transistor by W． B． Shockley in the USA in 1948． This device replaced the valve in radios． 　　There have been many changes in transport, too, since the development of the wheel, 6, 000 years ago． Daimler and Benz, both Germans, built one of the first practical petrol-driven motor cars in 1885． Only 18 years later, the Wright brothers, from America, flew their first plane． 　　Now, we have jets and, since the work of Christopher Cockerell in Britain in the 1950's, the hovercraft． 　　In medicine, the most significant advance came in 1928, when Sir Alexander Fleming, also an Englishman, discovered penicillin, which has saved countless lives since． 1．Which of these was invented or discovered first? Put them in order． A．the telephone B． penicillin　　 C． the transistor D． the steam engine E． radio　　　　F． the plane　　 G． the motor car H． the wheel 1_____ 2 ______ 3 ______ 4 _______ 5 _______ 6 _______ 7 _______ 8 _______ 2．James Watt was _______ A．a Scottish engineer．　　 B． an English engineers C．an Italian engineer．　　 D． a German engineer． 3．Our way of life has changed greatly ever since　　 A．James Watt produced an efficient steam engine． B．the revolution in communications． C．the discovery of penicillin． D．we have jets． 4．Choose the right words to complete the sentences． A．Bell 　　 the telephone in 1876． B．Penicillin _____ _____ by Fleming in 1928． C．Valves in radios have now been _____ by transistors． D．One of the first practical petrol-driven motor cars _____ ______ by two German engineers．