分界线、结构围框线、功能围框线、分组围框线一般用（）表示。
A．实线
B．虚线
C．点画线
D．双点画线
参考答案：C
Ted was hard-working. His success made him work_____.
A．harder
B．hardest
C．more quickly
D．most quickly
乳牙萌出完成时间
A．1岁半左右
B．2岁左右
C．2岁半左右
D．3岁左右
E．以上都不是
