以下四个措施中：①马路旁的房子的窗户采用双层玻璃；②城市禁止机动车鸣喇叭；③马路两旁植树；④高架道路两侧设隔音板墙．对控制噪音污染有作用的是（ ）
A．①②
B．②④
C．①②④
D．①②③④
①双层玻璃可以在传播过程中减弱噪声，符合题意；
②禁止机动车鸣喇叭是在声音的产生处减弱噪声，符合题意；
③马路两旁植树可以在传播过程中减弱噪声，符合题意；
④高架道路两侧设隔音板墙可以在传播过程中减弱噪声，符合题意；
故选D．
| 阅读理解。 | |
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| Bill Gates is head of the software company Microsoft and one of the world's richest men. He was born on October 28, 1955 and grew up in Seattle with his two sisters. He was a very bright boy. Science and math were his two favorite subjects at school. And he dreamed of being a scientist. Bill first started to play on computers at the age of 13. At that time, a computer was a very large machine. Once he was interested in a very old computer. He and some of his friends spent as much time as possible on computers. In the end, they worked out a software program. Bill sold it for 4,200 dollars when he was only 17. In 1973, Bill went to Harvard University. In 1975, Bill and his partners developed a software program called BASIC. This was not the first program ever created, but its inventors were the first to decide that people who wanted to use it should pay for it. BASIC was a success. Then Bill left Harvard to work for Microsoft, a company he started in 1975 with his boyhood friend Paul Allen. They thought the computer would come into every office and every home soon. So they began developing software for personal computers. They improved the software to make it easier for people to use computers. After many years of hard work, Microsoft becomes one of the most successful companies. And Bill Gates also becomes one of the richest businessmen in the world. | |
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