38. How is virtual reality surgery performed?

　　A) It is performed by a computer-designed high precision device.

　　B) Surgeons wear virtual reality helmets to receive feedback provided by a computer.

　　C) Surgeons move robotic instruments by means of a computer linked to them.

　　D) A 3-D image records the movements of the surgeons during the operation.

　　39. During virtual reality operations, the surgeon can have a better view of the cuts in the body because _____.

　　A) he is looking at the cuts on a computer screen

　　B) the cuts can be examined from different angles

　　C) the cuts have been highly magnified

　　D) he is wearing 3-D glasses

　　40. Virtual reality operations are an improvement on conventional surgery in that they _____.

　　A) cause less pain to the wounded

　　B) allow the patient to recover more quickly

　　C) will make human surgeons' work less tedious

　　D) are done by robot surgeons with greater precision

　　答案：

　　Unit 10

　　21.A 22.B 23.C 24.A 25.D 26.B 27.D 28.C 29.A 30.D

　　31.B 32.C 33.B 34.D 35.A 36.C 37.A 38.C 39.D 40.D