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一个C类网络用掩码255.255.255.192划分子网，会产生（）个可用子网。
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中国美术的起源和萌芽时期是（）时代的美术。
在计算应纳税所得额时，商场销售商品而发生折扣和折让，与收入写在在同一张发票上的，不并入应纳税所得额。
请查阅相关资料或手册，查询某一培养基配方，试阐述其中各个成分的作用，并判断属于什么类型的培养基（书本上的培养基除外）。
阅读判断：下面的短文后列出了7个句子，请根据短文的内容对每个句子作出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C。 When Our Words Collide “Wanna buy a body?” That was the opening line of more than a few phone calls I got from freelance(自由职业 ) photographers when I was a photo editor at U.S. News. Like many in the mainstream press, I wanted to separate the world of photographers into “them”, who trade in picture of bodies or chase celebrities, and “us”, the serious news people. But after 16 years in that role. I came to wonder whether the two worlds were easily distinguishable. Working in the reputable world of journalism, I assigned photographers to cover other people’s nightmares. I justified invading moments of grief, under the guise(借口) of the reader's right to know. I didn’t ask photographers to trespass(冒犯) or to stalk(跟踪),but I didn’t have to: I worked with pros(同行) who did what others did: talking their way into situations or shooting from behind police lines to get pictures I was after. And I wasn’t alone. In the aftermath of a car crash or some other hideous incident when ordinary people are hurt or killed, you rarely see photographers pushing past rescue workers to capture the blood and gore(血雨腥风). But you are likely to see the local newspaper and television photographers on the scene - and fast. How can we justify our behavior? Journalists are taught to separate doing the job from worrying about the consequence of publishing what they record. Repeatedly, they are reminded of a news-business dictum(格言): leave your conscience in the office. You get the picture of the footage: the decision whether to print or air it comes later. A victim may lie bleeding, unconscious, or dead: your job is to record the image. You put away your emotions and document the scene. We act this way partly because we know that the pictures can have important meaning. Photographs can change deplorable(凄惨的) situations by mobilizing public outrage or increase public understanding. However, disastrous events often bring out the worst in photographers and photo editors. In the first minutes and hours after a disaster occurs, photo agencies buy pictures. Often an agency buys a picture from a local newspaper or an amateur photographer and put it up for bid by major magazines. The most keenly sought “exclusives” command tens of thousands of dollars through bidding contests. Many people believe that journalists need to change the way they do things, and it’s our pictures that annoy people the most. Readers may not believe, as we do, that there is a distinction between sober-minded “us” and sleazy(低级庸俗的) “them”. In too many cases, by our choices of images as well as how we get them, we prove our readers right.Journalists aren’t supposed to think about whether they are doing the right thing.
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