四六级考试

【单选题】
A、They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.

网考网参考答案：B
网考网解析：
What should parents do to prevent playground injuries document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>