问题补充：
—Our P.E. teacher isn’t as young as he , is he?
—No, but he is one of in our school.
A. looked; the youngest teacher
B. looks; the youngest teachers
C. looks; the oldest teachers
D. looked; the oldest teacher
答案：
A. looked; the youngest teacher
(答案→)B. looks; the youngest teachers
C. looks; the oldest teachers
D. looked; the oldest teacher
解析：look young固定短语，看上去很年轻，one of +形容词的最高级表示…其中之一
