积极的课堂气氛是_____、热烈而深沉、宽松与严谨的有机统一。
参考答案：恬静与活跃
单项选择。
Lily and Lucy are twins. They ______. [ ]
A．look like
B．look like the same
C．look the same
D．looks like
大气污染可能导致失明和呼吸道疾病。（）
A.正确
B.错误
