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绘制数据流图通常遵循的原则是（）
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灰铸铁中的碳以（）状石墨存在，可锻铸铁的石墨呈（）状。
（C）Honey (蜂蜜) from the African forest is not only a kind of natural sugar, it is also delicious. Most people, and many animals, like eating it. However, the only way for them to get that honey is to find a wild bees’ nest (巢) and take the honey from it. Often, these nests are high up in trees, and it is difficult to find them. In parts of Africa, though, people and animals looking for honey have a strange and unexpected helper—a little bird called a honey guide.The honey guide does not actually like honey, but it does like the wax (蜂蜡) in the beehives (蜂房). The little bird cannot reach this wax, which is deep inside the bees’ nest. So, when it finds a suitable nest, it looks for someone to help it. The honey guide gives a loud cry that attracts the attention of both passing animals and people. Once it has their attention, it flies through the forest, waiting from time to time for the curious animal or person as it leads them to the nest. When they finally arrive at the nest, the follower reaches in to get at the delicious honey as the bird patiently waits and watches. Some of the honey, and the wax, always falls to the ground, and this is when the honey guide takes its share.Scientists do not know why the honey guide likes eating the wax, but it is very determined in its efforts to get it. The birds seem to be able to smell wax from a long distance away. They will quickly arrive whenever a beekeeper is taking honey from his beehives, and will even enter churches when beeswax candles are being lit. What can be the best title for the text?（）
家用半自动洗衣机洗衣桶内波轮的运转大多采用（）来实现。
（D）Television will turn 86 years old on September 7, 2013, and it has never looked better. In its youth, television was a piece of furniture with a tiny, round screen showing unclear pictures of low-budget programs. In spite of its shortcomings, it became popular. Between 1950 and 1963, the number of American families with a television jumped from 9% to 92% of the population.As the audience got larger, the technology got better. Television sets became more reliable through the 1960s. Both of the reception and the picture improved. The major networks started broadcasting programs in color.Even greater improvements were coming according to Sanford Brown, who wrote an article for the Post in 1967. Surprisingly, just about every prediction he made in the article became a reality. For example: All sets in the not-distant future will be color instruments. He also predicted that TV sets would become smaller, simpler, more reliable and less expensive and may forever put the TV repairman out of work. Smaller sets do not, of course, mean smaller screens. TV engineers expect screens to get much bigger. However, today’s 3-D TV is even farther away, if it’s coming at all. There is some doubt whether the public would be eager to pay for it, in view of people’s cold reception given to 3-D movies.But the technology with the greatest potential, according to Brown, was cable television (有线电视), which was still in its early stages then. As he predicted, the future of cable television was highly interactive (互动的). It wasn’t cable television that gave Americans their electronic connection to the world, however. It was the Internet. He even foresaw the future office: using picture phones, big-screen televisions for conferences, and computers providing information, at the touch of a button.Brown ever said, “The future of television is no longer a question of what we can invent. It’s a question of what we want.” Which of the following is NOT true?（）
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