问题 单项选择题

龈谷的组织学特点是()

A.覆盖无角化上皮

B.上皮钉突数量少

C.无炎细胞浸润

D.含有黏膜下层

E.含有颗粒层

答案

参考答案:A

解析:龈谷上皮为薄的无角化上皮,有上皮钉突;由于解剖的关系,容易集聚细菌而发生牙龈炎;牙槽黏膜没有黏膜下层。所以选A。

填空题

词汇运用。

     During the Second World War, John's family didn't have a washing machine.Therefore,     1   (keep)

clothes clean became a problem for them. Before long, a family friend decided    2    (join) the army and

his wife was going with him. John's family told them that they could take care of their furniture while they

were away. To the     3   (family)surprise, the friend suggested they should use his Bendix washing machine.

 "It would be better for it to     4   (use), rather than sitting    5    (quiet)," he said.

     Young John helped with the washing, and he developed a deep love of the old, green Bendix.     6  

(Late), the war ended and the family's friend returned. When he came to take the machine away. John

became very sad. His mother saw this and said to     7    (he), "Son, you must remember that machine

didn't belong to us in the   8    (one) place. It was a gift for us to be able to use it for such a long time. So,

instead of     9   (be) sad about the loss, let's be grateful that we    10    (be ) able to use it at that time."

     We have all experienced loss: loss of people and things. However, if we see the thing we     11   (lose) as

a gift that we were given for a time, maybe the sad     12   (memory) will change into     13   (thank ) ones.

1.______ 2.______ 3.______ 4.______ 5.______ 6.______7.______

8.______ 9.______ 10.______ 11.______ 12.______ 13.______

多项选择题