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.
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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
有关正常肾脏超声图像的叙述，以下不正确的是
A. 肝脏和脾脏的回声高于肾实质回声
B. 青少年和婴儿的肾锥体回声更低，可近似无回声
C. 肾皮质和肾锥体之间有时可见短线状或点状高回声代表肾叶间动脉
D. 在膀胱高度充盈状态下，肾盂的无回声区可宽达1～2cm
E. 肾窦呈高回声，与腹膜后大血管周围的脂肪组织回声一致
Questions 16 to 19 are based on the passage you have just heard.
A. They moved out of the college dorms at the end of the semester.
B. They were more appreciative of the university"s housing policy.
C. They broke up more often than same-race roommates.
D. They generally spent more time together than white pairs.
Questions 12 to 15 are based on the conversation you have just heard.
A. It was named after a land owner in the old days.
B. It will be used as a centre for athletic training.
C. It is located in the eastern part of Harrogate.
D. It is protected as parkland by a special law.
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