Questions 12 to 15 are based on the conversation you have just heard.
A. The vast grassland.
B. The refreshing air.
C. The beautiful flowers.
D. The mineral waters.
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Questions 23 to 25 are based on the passage you have just heard.
A. Frightened victims can rarely make correct identification.
B. Many factors influence the accuracy of witness testimony.
C. Eyewitnesses are often misled by the lawyer"s questions.
D. The US judicial system has much room for improvement.
Questions 9 to 11 are based on the conversation you have just heard.
A. Press the right-hand lever first.
B. Produce the appropriate sound.
C. Raise their heads above the water.
D. Swim straight into the same tank.
Questions 20 to 22 are based on the passage you have just heard.
A. It comes regularly from its donors.
B. It has been drastically cut by NASA.
C. It has been increased over the years.
D. It is still far from being sufficient.
以下对颈部及脑血管描述不正确的是
A. 脑部血液供应由双侧颈动脉和椎动脉
B. 左颈总动脉起始于无名动脉
C. 右颈总动脉起始于无名动脉
D. 左颈总动脉起始于主动脉弓
E. 颈内动脉分出眼动脉、前脉络动脉及大脑中动脉
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