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问题 单项选择题

龋齿药物治疗应注意的是

A．避免露髓可不去腐质
B．应尽量恢复牙齿外形
C．保护口腔粘膜避免刺激和腐蚀
D．制备固位力洞形
E．选择含氟材料充填

答案

参考答案：C

解析：药物治疗无法恢复外形应保护口腔粘膜避免刺激和腐蚀，应去除腐质。

单项选择题

Questions 58 to 62 are based on the following passage: ( 10分)　　According to the airline industry statistics, almost 90% of airline accidents are survivable or partially survivable. But passengers can increase their chances of survival by learning and following certain tips. Experts say that you should read and listen to safety instructions before takeoff and ask questions if you have uncertainties. You should fasten your seat belt low on your hips as tightly as possible. Of course, you should also know how the release mechanism of your belt operates. During takeoffs and landings you are advised to keep your feet flat on the floor. Before takeoff you should locate the nearest exit and an alternative exit and count the rows of seats between you and the exits so that you can find them in the dark if necessary.　　In the event that you are forewarned of a possible accident, you should put your hands on your ankles and keep your head down until the plane comes to a complete stop. If smoke is present in the cabin, you should keep your head low and cover your face with napkins, towels, or clothing. If possible, wet these for added protection against smoke inhalation. To evacuate as quickly as possible, follow crew commands and do not take personal belongings with you. Do not jump on escape slides before they are fully inflated, and when you jump, do so with your arms and legs extended in front of you. When you get to the ground, you should move away from the plane as quickly as possible, and never smoke near the wreckage.

According to the experts, when should travelers read and listen to safety instructions

A．Throughout the flight

B．During landings

C．Before takeoff

D．In an emergency
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单项选择题

某零售商从批发商购进一种商品，其进货价格为10元/件，批零差率为30％，那么该商品销售价格为（）。

A.11

B.12

C.13

D.14
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