题目

现有下列物质：①CH3COOH ②NaOH ③SO2 ④Fe ⑤熔融KCl ⑥石灰水 ⑦稀硫酸 ⑧乙醇 ⑨NH3其中， 属于电解质的是___________，属于非电解质的是___________，能导电的是_____________； 答案：【答案】①②⑤ ③⑧⑨ ④⑤⑥⑦ 【解析】电解质是溶于水或者熔融状态下能导电的化合物，包括酸、碱、盐、金属氧化物等，则属于电解质的是①②⑤，非电解质是溶于水和熔融状态下都不导电的化合物，包括非金属氢化物、非金属氧化物、大多数有机物等，则属于非电解质的是③⑧⑨，电解质溶于The name “cowboy” conjures up many different images from movies, songs and TV. These imagined cowboys range from white-hat-wearing heroes to gun-shooting hooligans(流氓).But, cowboys are actually real people from US history.When the US Civil War ended, many soldiers had no place to call home. So, they began to drift to the country’s rural West. Ranchers(农场主) hired these men to take care of the cattle and work around the ranch. When the ranch owner wanted to sell the cattle, the cowboys would round up the herd from the open prairie(牧场) and drive the cattle miles to the market.With the invention of barbed wire(铁丝网),the cowboy era(1865-1890) began to come to an end. But people in the East had always been curious about their lifestyle. Many country/western songs during this time tried to capture the true cowboy spirit. Newspapers published cowboy tales in serial form and adventure novels followed. The bigger the fiction,  the better the sales. These novels often portrayed cowboys as cruel and violent men. Cowboys carried the bad reputation for many years afterwards.When movies began to be popular in the 1920s, the cowboy image changed again. Now, a cowboy became the great white knight(骑士) that loved his horse more than the beautiful ladies he rescued. As the cowboy of the “Old West” spent more time with his horse than the ladies, this era's image was not entirely false.Then, in the 50s,Hollywood began producing so-called “spaghetti westerns(意大利西部片)”.They earned the nickname because Italian companies financed the films and TV shows. This started the decade’s “Cowboy Craze”. While this didn’t last long, it made modern country / western music, fashion and dance extremely popular.In recent years, with the help of musicians, radio stations and bars, cowboy nostalgia(怀旧情绪) has returned. Even though his image is still changing — somewhere between ballad singing country boy and bar room fighter — there’s one thing for sure, you can’t keep the cowboy down.【小题1】The purpose of this story is to ______.A．introduce cowboy movies and novelsB．introduce various productions associated with cowboysC．show the cowboy's everlasting charmD．inform us about the cowboy’s spirit【小题2】Before they became cowboys, they ______.A．served in the armyB．worked as bar-room fightersC．owned ranchesD．were adventurous explorers【小题3】During “the cowboy era” mentioned in the story, ______________.A．the cowboy often came to the rescue of ladies in newspaper talesB．the distant Wild West appealed to people in the EastC．cowboys were shown as cruel and violent men on the silver screenD．country music started the cowboy craze which swept the whole country【小题4】By saying “you can’t keep the cowboy down”, the writer means that ______.A．cowboys are real people in historyB．cowboys still fascinate peopleC．you can't make cowboys unhappyD．you can’t grasp the cowboy spirit【小题5】Which of the following statements would the writer agree to?A．The cowboy has been presented in different lights in different eras.B．Cowboys are gun-shooting hooligans, without doubt.C．Cowboys have always been a passing phenomenon.D．Cowboys enjoy Italian foods, for example, spaghetti.