B．that解析：空处应用what引导宾语从句在从句中作主语。答案：D第二节(共10小题；每小题1.5分满分15分)阅读下面材料在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 big cities，especially in places 41.________ traffic is very heavy and crossing the road is dangerous.The purpose of these bridges 42.________(be) to enable pedestrians to cross roads

　　43.________ (safe)．Overhead bridges are used in very much the same way 44.________zebra crossings.They are more efficient although 45.________(little) convenient because people have to climb up a long flight of steps.This is

　　46.________

　　(convenient) especially to older people.When pedestrians use an overhead bridge，they do not hold up traffic.However，when they cross a busy road using a zebra crossing，traffic is held up.This is why the government has built many overhead bridges

　　47.________

　　(help) pedestrians and to keep traffic moving at the same time.For their own safety，pedestrians should be encouraged to use them instead of

　　48.________

　　(risk) their lives by dashing across the road.Old people，however，may find it a little difficult climbing up and down the steps，but it is still much safer than walking across the road with all the danger of moving traffic.Overhead bridges serve a very useful purpose.Pedestrians，both old and young，should make

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