第12题: [单项选择]The children, ________ had played the whole day long, were worn out. A. all of what B. all of which C. all of them D. all of whom 参考答案:D 答案解析:考查定语从句。先行词为children，故排除A、B两项；allofthem不能构成定语从句。D项中whom为关系代词，指代前面的children，故答案为D项。
What kind of person is a color-blind person
He can’t ______________________ all kinds of colors. 参考答案:tell 答案解析:[听力原文] 11-15
(11){{U}}If people can’t tell all kinds of colors, we can say they are color-blind
