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问题 选择题

My elder brother has gone to Tibet to work as a volunteer teacher. Influenced by him, I also want to become

______ when I graduate from the university.[ ]

A. that

B. it

C. this

D. one

答案

答案：D

解答题
试判断(1-
1
22
)(1-
1
32
)(1-
1
42
)…(1-
1
n2
)的值与
1
2
的大小关系，并证明你的结论．
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单项选择题

骨巨细胞瘤病理基础主要表现为肿瘤组织质地疏松、出血、坏死和囊性变。与其相对应的声像图表现：

A．病变发生于骨骺端的松质骨内

B．病变部位呈偏心性肿大

C．肿瘤与正常骨质界线清楚

D．肿瘤透声性良好，后部边界回声增强

E．彩色多普勒血流显像见少许点状血流或较丰富血流

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