______forms a natural boundary between Mexico and the United States.
A. The Rio Grande River
B. The Mississippi River
C. The Colorado River
D. The Gulf of Mexico
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The best title for the passage is
A. Mr. Obama"s Dilemma.
B. University Challenge.
C. The Rising Cost.
D. Anger about College.
The italicized "students feel short-changed by professors" (Para. 5) probably means
A. students worry about what professors do research on.
B. students feel it doesn"t pay to study at university.
C. students are obsessed with too much research.
D. students suffer from different mental problems.
进行禁水一加压试验后，尿比重可达1．020，应考虑下列哪项诊断
A. 精神性烦渴
B. 垂体性(中枢性)尿崩症
C. 肾性尿崩症
D. 肾小管性酸中毒
E. 糖尿病
What function does the third paragraph serve？
A. It continues the analysis of the problem.
B. It confirms the seriousness of the problem.
C. It further explains the soaring cost.
D. It offers a cause for the rising cost.
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