However, critics argue that once drivers know that these speed breakers are visual illusions, they may ignore them. Others also point out that India's decision does not consider the safety of a large number of pedestrians. In the end, the new policy may be just one step towards improving road safety.

　　29. Why are 3D paintings used on main highways and roads?

　　To make the surroundings more beautiful.

　　To attract the attention of tourists.

　　To reduce the rate of traffic accidents.

　　To show the advanced technology.

　　30. Which of the following words is closest to the meaning of “hazard” in paragraph 2?

　　Reminder

　　B.Threat

　　C.Regulation

　　D.Theory

　　31. What can we learn from Paragraph 3 and 4?

　　Philadelphia, the U.S.A is th second place to use virtual speed breakers in the world.

　　The idea tested in Ahmedabad recently has been a failure.

　　The new policy of 3D zebra crossings must be carried out smoothly.

　　The use of optical illusions as speed breakers is controversial in India.

　　32. What do we

　　know about 3D zebra crossings from the passage?

　　They can vastly lower the death rate in India.

　　They have been widely used in India so far.

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