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问题 单项选择题

某一患者的上颌第一前磨牙因深楔状缺损露髓需行开髓治疗，在面开髓过程中破坏上颌第一前磨牙面的解剖结构有（）。

A．颊尖，舌尖

B．颊尖三角嵴，中央窝，近中沟，近中边缘嵴

C．颊尖三角嵴，舌尖三角嵴，中央沟

D．舌尖三角嵴，舌尖，近中沟，远

E．以上都不是

答案

参考答案：C

阅读理解
请仔细阅读题中的学生情况说明，从A—F中选出能解决他们问题的恰当建议。(有一项多余)
A．Emily often feels tired and seems to be lack of energy.
B．Jeff spent his summer vacation on the beach and got serious sunburnt.
C．Kate has poor eyesight and she can’t see clearly at night.
D．Tony sometimes feels pains in his bones and he has loose teeth.
E. Luke is so careless that he often gets hurt. And it takes a long time for his wound to heal.
F. Linda feel nervous before the new people.

1.Vitamin A
What can high-vitamin A foods do for you?
be great for night vision
help you see in color
help your grow properly and aids in healthy skin
﹡ vitamin A in carrots helps you see at night

2.The B vitamins
What can the B vitamin do for you?
help make energy and set it free
help make red blood cells which carry oxygen(氧气) throughout your body
﹡ The B vitamins in leafy green vegetables help your body make protein(蛋白质)and energy.

3.Vitamin C
What can vitamin C do for you?
keep body tissues(组织) in good shape
help you heal when you get hurt
help your body resist infection
﹡ Vitamin C in oranges helps your body heal if you get a cut

4. Vitamin D
What can vitamin D do for you?
help keep your bones strong and healthy
help keep your teeth strong and healthy
help your body absorb the amount of calcium(钙)
﹡ Vitamin D in milk helps your bones and teeth.
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5. Vitamin E
What can vitamin E do for you?
protect your skin from ultraviolet(紫外线) light
protect you lungs from becoming damaged by polluted air
help make red blood cells
﹡ Sunflowers seeds are the richest in Vitamin E
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单项选择题

在供暖管网中安全阀的安装做法，哪项是不必要的

A．蒸汽管道和设备上的安全阀应有通向室外的排汽管
B．热水管道和设备上的安全阀应有通到安全地点的排水管
C．安全阀后的排水管应有足够的截面积
D．安全阀后的排汽管上应设检修阀
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