题目

甲、乙两种固体物质的溶解度曲线如图所示．下列有关叙述中错误的是（     ） A．t1℃时，甲物质的溶解度与乙物质的溶解度相等 B．t2℃时，将50g甲物质放入100g水中，所得溶液的质量为150g C．升高温度可将乙物质的饱和溶液变为不饱和溶液 D．当甲物质中含少量乙物质时，可用降温结晶的方法提纯甲物质Americans: Restless? Illiterate（没文化的）?Americans are queer people: they can’t rest．They have more time, more leisure, shorter work hours, more holidays, and more vacations than any other people in the world．But they can’t rest．They rush up and down across their continent as tourists; they move about in great herds to conferences; they search the wilderness; they flood the mountains; they keep the hotels full．But they can’t rest．The scenery rushes past them．They learn it．Battles and monuments are announced to them on a tour bus．They hear them, but they don’t get them．They never stop moving; they rush up and down as Shriners, Masons, Old Graduates, Bankers—they are a new thing each day, always rushing to a reunion or something．So they go on rushing about till eventually the undertaker （殡葬工） gather them to a last conference．Americans are queer people: they can’t read．They have more schools, and better schools and spend more money on schools and colleges than all Europe．But they can’t read．They print more books in a year than the French print．But they can’t read．They cover their country with one hundred thousand tons of Sunday newspapers every week．But they don’t read them．They’re too busy．They use them for fires and to make more paper with．They buy eagerly thousands of new novels at two dollars each．But they read only page one．Their streets are full of huge signs．They won’t look at them．Their streetcars are filled with advertising; they turn their eyes away．Transparent colors, cart wheels, and mechanical flares whirl and flicker in the crowded streets at night．No one sees them．Tons of letters pour into the mail boxes, through the houses, and down the garbage cans．No one reads them．68．The underlined word “queer ” means ___________． A．strange     B．difficult    C．forgetful   D．friendly69．According to the text, when do the Americans stop rushing about ? A．When they are to allowed to．B．When they feel tired and sleepy C．When they stop breathing eventually      D．When they are seriously ill in bed70．The Americans know the places of battles and monuments ___________． A．by driving there in person      B．when they are on the tour bus C．from books and magazines      D．by visiting them71．Why does the writer write this passage? A．To tell people the Americans are illiterate B．To prove the Americans to be a queer nation C．To make fun of the American way of life D．To give the readers information about USA