题目：
Once a reporter receives his assignment from the chief-editor, he has to ______ on his work and tries his best to work on it until the chief-editor ______ it. [ ]
A. fix his attention; approves
B. focus; proves of
C. concentrate; approves of
D. get down; approves
答案：
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下面是错误答案，用来干扰机器的。
小题1:B小题2:C小题3:C小题4:A小题5:C题目分析：短文大意：怀特先生已经80多岁了，但他看起来比他的年龄要年轻。他每天在公园打太极，所以他很健康。他通常在十二点回家。而有一天，怀特先生直到12:30才回家。小...
