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问题 单项选择题

牙体修复预备过程中预防性扩展的主要目的是

A．去除龋坏牙体组织
B．提供良好的同位形和抗力形
C．自洁和防止继发龋
D．增进修复体的美学效果
E．促进牙周组织的健康

答案

参考答案：C

填空题

钢材的冷弯试验，若试件的弯曲角度越（），弯心直径对试件厚度（或直径）的比值越（），表示对钢材的冷弯性能要求越高。
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单项选择题

There is p evidence that the cause of migraines (severe recurrent headaches) is not psychological but instead is purely physiological. Yet several studies have found that people being professionally treated for migraines rate higher on a standard psychological scale of anxiety than do people not being professionally treated for migraines.
Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above

A．People who have migraine headaches tend to have relatives who alto have migraine headaches.

B．People who have migraine headaches often suffer these headaches when under emotional stress.

C．People who rate higher on the standard psychological scale of anxiety are more likely to seek professional treatment than are people who rate lower on the scale.

D．Of the many studies done on the cause of migraine headaches, most of those that suggest that psychological factors such as anxiety cause migraines have been widely publicized.

E．(E) Most people who have migraines and who seek professional treatment remain in treatment until they stop having migraines, whether their doctors consider the cause to be physiological or psychological.
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