如果你家附近建筑工地在施工，影响你的学习和休息，为了减小噪声的干扰，下列做法不合理的是（ ）
A．关紧门窗
B．打开门窗，让空气加快流通
C．戴上耳罩
D．告知有关部门督促施工单位合理安排施工时间。
答案：B
题目分析：噪声是指无规律、难听刺耳或影响人们正常生活、学习的声音。要减弱噪声人们通常从噪声产生、噪声的传播及噪声的接收这三个环节来进行防治。在选项A、C、D中分别是从声音的传播、声音的接收和声音的产生来进行噪声的防治。所以选项B是不能防治噪声，因此选B。
Overhead bridges can be seen in many Parts of Singapore，in the places where traffic is very 41 and crossing the road is not safe. These bridges can help people cross roads 42 . Overhead bridges are used in very much the same way 43 zebra crossings. They are more efficient(效率高的)，thou 44 convenient(方便的)because people have to climb up a lot of steps．This is inconvenient to the old. When people use an overhead bridge，they do not 45 traffic. But when they cross a busy road using a zebra crossing, traffic is kept back. This is 46 the government has built many overhead bridges to help people and keep traffic moving at the same time. The government of Singapore has spent a lot of money 47 these bridges. For their own safety, people should be advised to use them instead of rushing across the 48 . Old people may find it a little difficult to climb up and 49 the steps, but it is still much safer than walking across the road with all the moving traffic. Overhead bridges are very 50 . People，both old and young，should always use them. This will stop accidents from happening.
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