– What are you reading,Tom?-- I’m not really reading,just --

答案：C
1.各项短语解释：
turn off 关掉；拐弯；解雇
turn around (使)转身；(使)转向；好转
turn over (使)翻转；调转；移交/交给；变换（电视频道）
turn up 开大；出现
再如：Having read Page 1,he turned over to page 2.
他读完第一页后,就翻到第二页.
2.所以正确答案为C.