WHO已将下列哪种儿童常见病列为需重点防治的第三位非传染病（）
A.近视
B.沙眼
C.龋齿
D.肥胖
E.蛔虫感染
参考答案：C
—Has Bob got back to school yet?
—Yes. He's back for 2 days. [ ]
A. gone
B. got
C. been
We have ______ the room every day. [ ]
A. breakfast in
B. the breakfast on
C a breakfast in
D. an breakfast on
