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问题 单项选择题

有一种矿物的化学成分为CaCO3，具有三组完全解理，白色、结晶形状呈菱形六面体，硬度为3，玻璃光泽，遇冷稀盐酸起泡。该矿物是：（）

A.白云石

B.滑石

C.石英

D.方解石

答案

参考答案：D

改错题

It was 7:15 in the morning of February 8, 2007． I was walking along Park Road towards the east while an old man came out of the park on the other sides of the   street． Then I saw a yellow car drive up Third Street and made a right turn into Park Road． The next moment the car hit the man while she was crossing the road． He fell with a cry． The car didn’t stop and drive off at full speed heading west． I noticed the driver was young woman wore a pair of glasses and the plate number was AC864． After two minutes later, I stopped a passed car and took the old man to the nearest hospital．                        
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问答题

试述秘书工作的本质特征。
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