四六级考试

【单选题】
A、Recent developments in news photography
B．The effect of water-based ink on standard printing procedures
C．The advisability of frequent changes in dry-cleaning
D．Experimental printing with oil-based inks

网考网参考答案：B
网考网解析：
[听力原文]17-20 Listen to a talk. Its always a pleasure to show visitors the different parts of our newspaper operation. Please step this way. Here you see our printing presses, and you’ll probably notice the smell of the printer’s ink This is where the pa per is printed. Printing is a really messy process because of the black, oil - based ink we use. You’ve read news papers and come away with the black ink all over your hands, and then probably got, it on your clothes or on the woodwork at home, fight That may change soon, with the use of a different type of ink. Several major daily newspapers are now trying out a new printing process called ’flexography’. This process produces smear--free pages that are remarkably clean and do not smudge. Flexography is often referred to as "flexo". "Flexo" presses use water- based inks that dry quickly, not like the standard oil- based inks that take much longer to dry. The new flexography inking process is also simpler and faster than the standard method. There’s one major problem, though. The ink may dry too quickly, and thereby gum up the machines. It could obstruct the pres scs, so that they won’t work right, or it might cause them to break down altogether. If the machines clog too easily, the process will have to be changed and retested. There’s a possibility that our newspaper will convert to the flexography process sometime soon. In any ease, our readers have already expressed a definite preference for the new smudge less papers, and dean bands. 17. What is the main topic of the talk 判断细节题，可由全文推出答案。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>