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问题 选择题
— This returned scientist has become one of the top experts in his field. 
— Yes, I know him very well. He once _____ in South America with wild animals for eight years.

A. has worked
B. worked
C. had worked
D. has been working
答案

答案：B

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填空题

（2分）已知：下列两个热化学方程式：

Fe(s) + 1/2O2(g)  FeO(s)   =－272.0KJ/mol

2Al(s) + 3/2O2(g) Al2O3(s)  =－1675.7KJ/mol

则 Al(s)的单质和FeO(s)反应的热化学方程式是______________________________________________________ 。
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