正常人30岁前角膜内皮细胞平均每平方毫米为（） A.2600～2800个 B.150_爱下问搜题

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问题单项选择题

正常人30岁前角膜内皮细胞平均每平方毫米为（）

A.2600～2800个

B.150～2400个

C.1500～2000个

D.6000～8000个

E.3000～4000个

答案

参考答案：E

选择题

China _______ rapid progress in space technology in the last 10 years.

A．made

B．has made

C．had made

D．were making

选择题

Some people in the mountains hunt wild animals ______ a living. [ ]

A. at

B. to

C. with

D. for