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问题 单项选择题 A1/A2型题

PFM修复体是由下列哪一项在真空炉内烧结而成的修复体？（）

A.高熔瓷粉与镍铬合金

B.中熔瓷粉与烤瓷合金

C.低熔瓷粉与中熔合金

D.低熔瓷粉与烤瓷合金

E.低熔瓷粉与金合金

答案

参考答案：D

单项选择题

伦理委员会的职责不包括（）

A.审核药物试验方案

B.审核研究者手册、知情同意书

C.审核药物生产的条件

D.审核受试者的入选方法

E.审核研究者的资格
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单项选择题

The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. (51) these wide modern roads are generally smooth and well maintained, with (52) sharp curves and many straight sections, a direct route is not always the most (53) one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally (54) large urban centers which means that they become crowded with heavy traffic during rush hours, (55) the "fast, direct" way becomes a very slow route.

However, there is almost always another route to take (56) you are not in a hurry. Not far from the (57) new "super highways", there are often older, less heavily traveled roads which go through the countryside. (58) of these are good two-lane roads; others are uneven roads curling through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns (59) in deep valleys. Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a (60) to get a fresh, clean view of the world.

52().

A. little

B. few

C. much

D. many
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