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问题 单项选择题 A3型题

男孩，10岁，暗适应能力下降，左眼结膜颞侧1/4处有白色泡沫状聚集物。病理检查示，聚集物为角化的结膜细胞。

该患儿最可能的病因是（）

A.维生素B缺乏

B.维生素B缺乏

C.维生素A过量

D.体内脂质过高

E.维生素A缺乏

答案

参考答案：E

补全对话，情景问答

补全对话。

Li Lei: Oh, it’s you, Lucy. 1._____to see you.

Lucy: Nice to 2._____you, too. Mary.

Li Lei: Come in, please, Mum, 3._____is Lucy, my friend. She 4._____

American. And this is my mother, Lucy.

Mum: 5._____do you do, Lucy?

Lucy: 6._____do you do, Aunt?

Mum: Sit down, please, Lucy.

Li Lei: 7._____ you like 8._____ milk?

Mum: I don’t like 9._____very much.

Li Lei: 10._____would you like?

Lucy: I’d 11._____a pear.

Li Lei: OK. 12._____you 13._____! What 14._____ something to drink?

Lucy: All right.

Li Lei: 15._____it is!

Lucy: Thanks!
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单项选择题

哪个牙与相邻恒磨牙的形态相似

A．上颌乳尖牙
B．下颌乳尖牙
C．上颌乳中切牙
D．上颌第二乳磨牙
E．下颌第一乳磨牙
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