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问题
单项选择题
我国是世界上第（）个建立卫星导航系统的国家。
A.三
B.四
C.五
答案
参考答案：A
选择题
When I was a little boy,I lived in a small fishing village.The visit to the village made me think of the
________of my childhood.
[ ]
A. views
B. scenes
C. scenery
D. sights
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问答题
大脑皮质有哪些重要中枢各位于何处
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