首页
登录
职称英语
[originaltext] It was an Italian inventor who created the first wireless dev
[originaltext] It was an Italian inventor who created the first wireless dev
游客
2023-06-30
92
管理
问题
It was an Italian inventor who created the first wireless device for sending out radio signals in 1895. But not until the American inventor Lee De Forest built the first amplifying vacuum tube in 1906 did we get the first radio as we know it. And the first actual radio broadcast was made on Christmas Eve of 1906. That’s when someone working from an experimental station in Brand Rock, Massachusetts, arranged the program of two short musical selections, a poem and a brief holiday greeting. The broadcast was heard by wireless operators on ships with a radio through several hundred miles. The following year, De Forest began regular radio broadcasts in New York. These programs were similar to much of what we hear on the radio today in that De Forest played only music. But because there were still no home radio receivers, De Forest’s audience consisted of only wireless operators on ships in New York harbor. There is no doubt that radio broadcasting was quite a novelty in those days. But it took a while to catch on commercially. Why? For the "simple fact that only a few people, in fact, only those who tinkered with wireless telegraphs as a hobby, owned receivers. It wasn’t until the 1920’s that someone envisioned mass appeal for radio. This was radio pioneer, David Sarnoff, who predicted that one day there would be a radio receiver in every home.
Questions 22 and 25 are based on the passage you have just heard.
22. When was the first actual radio broadcast made?
23. Where did De Forest begin regular radio broadcasts?
24. Who had receivers in the early days of radio?
25. What did David Sarnoff predict about radios?
选项
A、They would get smaller in size.
B、Their signals would travel further.
C、They would become less popular than television.
D、They would be common household items.
答案
D
解析
语义理解题。根据录音“This was radio pioneer,David Sarnoff,who predicted that one day there would be a radio receiver in every home.”可知,总有一天,每个家庭都将拥有无线电收音机。故选项D为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/2795601.html
相关试题推荐
[originaltext]Duringa1995roofcollapse,afirefighternamedDonaldHerbe
[originaltext]Duringa1995roofcollapse,afirefighternamedDonaldHerbe
[originaltext]Duringa1995roofcollapse,afirefighternamedDonaldHerbe
[originaltext]Whenpeoplesucceed,itisbecauseofhardwork,butluckhas
[originaltext]W:Nowyou’vebeenananimaldoctorforsomethirtyyears.Whatw
[originaltext]W:Nowyou’vebeenananimaldoctorforsomethirtyyears.Whatw
[originaltext]W:Nowyou’vebeenananimaldoctorforsomethirtyyears.Whatw
[originaltext]M:Ireallydon’tknowwhattodothissummer.Ican’taffordto
[originaltext]M:Ireallydon’tknowwhattodothissummer.Ican’taffordto
[originaltext]BANGKOK-ThailandisAsia’sbiggestproductionbaseforpirat
随机试题
Itisagreedthatallnationsshouldtakemeasuresagainstterrorismonthebasi
[audioFiles]audio_ehbm_j16002(20082)[/audioFiles]A、Rainy.B、Sunny.C、Cloudy.D、
ResponseTimeisCriticalYou,yesyou,arer
根据《义务教育语文课程标准》(2011版)内容,完成下列填空。(5分) 义务教
一足月新生儿,出生体重2800g,身长48cm,面色红润,哭声响亮,吸吮有力,母
指数化型证券组合的特点是( )。 Ⅰ获得市场平均收益水平 Ⅱ投资风险较大
28岁,男性,自觉突然心慌,胸闷,听诊心率200次/分,心律齐,心音均等,血压正
49)750kV系统二次设备测量电压和电流时,电压表和电流表的内阻越小越好。(
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
关于城镇土地使用税的征收管理,下列说法正确的是()。A.城镇土地使用税的纳税地
最新回复
(
0
)