37. What do the two instruments mentioned in the second paragraph refer to?

　　A) The astronomical telescope and the wave-front sensor.

　　B) The aluminum mirror and the laser beam.

　　C) The active mirror and the contact lens.

　　D) The aluminum mirror and the wave-front sensor.

　　38. Individualized contact lenses are lenses designed ______.

　　A) to work like an astronomical telescope

　　B) to suit the wearers specific needs

　　C) to process extremely accurate data

　　D) to test the wearers eyesight

　　39. According to Bille, with the new lenses the wearers vision ______.

　　A) will be far better at night than in the daytime

　　B) may be broadened about 15 times than without them

　　C) can be better improved in the daytime than at night

　　D) will be sharper by a much greater degree at night than in the daytime

　　40. Which of the following is true about Billes lenses?

　　A) Their production process is complicated.

　　B) They will be sold at a very low price.

　　C) They have to be replaced every day.

　　D) Purchase orders can be made through the Internet.

　　答案：

　　Unit 9

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