Some insects（昆虫）have favorite colors. Mosquitoes（蚊子）prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid （帮助）of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes （形状）at night. One day we may even learn more about the invisible（看不见的）colors around us.

　　45. The passage is mainly about _____________.

　　A. color and its surprising effects.

　　B. women being luckier than men

　　C. danger caused by color blindness

　　D. color blindness

　　46. Why do some people say it is safer to be driven by women?_______

　　A. Women are more careful.

　　B. Women are fonder of driving than men.

　　C. There are fewer color-blind women

　　D. Women are weaker but quicker in thinking.

　　47. We can attract and kill mosquitoes by using a ________.

　　A. blue light

　　B. red light

　　C. yellow light

　　D. green light

　　D

　　Some saying: “Laughter is the best medicine." Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. They have found that laughter really can improve people's health.

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