关闭上中切牙间隙已被接受的方法有（）。
A.ab
B.ac
C.ad
D.bc
E.cd
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单词拼写。(每题0.5分，共5分)
1. Sometimes I wonder how _________（相关的） chemistry is to these students.
2. Please raise your hand if you are in f________ of the new plan.
3. It was such a __________( 特权 ) to have spend a day with Tombe’s family.
4. I thought my explanation would calm him down, but it turned out to have the o_______ effect.
5. He p________ a beautiful birthday gift for his girlfriend in Xinhua Shopping Center last month.
6. The sales team is working hard to achieve the _________( 目标 ) of selling 5,000 books this month.
7. He told us that he wouldn’t have done the job well without the __________ ( 鼓励 ) of his wife.
8. It wasn’t wise to r_________ from your job during such a crisis.
9. What a sweet victory to be __________ ( 羡慕 ) by those women!
10. That the famous magazine Reader’s Digest has d_______ it will close down comes as a shock to all of us.
患者男性，50岁，
如果该患者游离端的牙槽嵴低平，可以采用的办法除外哪一项（）
A.降低咬合至与对颌牙无接触
B.人工牙减数
C.减小人工牙颊舌径
D.采用RPI卡环组
E.增大基托面积
屏护是用（）把带电体同外界隔绝，防止人体触及或接近带电体造成触电事故。
A.绝缘材料；
B.屏护装置；
C.设备；
D.电器.
请在下图所示的Pb-Bi-Sn相图中：
(1)写出三相平衡和四相平衡反应式；
(2)标出成分为5%Pb、65%Bi与30%Sn合金所在位置，写出该合金凝固结晶过程，画出并说明其在室温下的组织示意图。
呼吸衰竭的治疗主要在于（）
A.治疗原发病
B.祛除诱因
C.O2潴留
D.纠正缺氧和
E.纠正酸碱平衡失调