The central idea conveyed in the passage is that ______.
A. home training is more important than school training in that a child spends se many hours with parents
B. teachers can and should help parents to understand the objectives of the school
C. parents need to realize how to cooperate with the teachers in educating their children
D. parents have unconsciously hindered and obstructed curricular objectives
耳郭假性囊肿
A. 好发于耳甲腔，耳后沟及耳道
B. 多发于1侧耳郭
C. 只发生于外耳道软骨部
D. 以外耳道内1/3为重
E. 弥漫性外耳道病变
工程咨询单位进行市场分析，在选择目标市场前，应进行( )。
A. 市场细分
B. 市场定位
C. 市场开拓
D. 广告宣传
某研究者收集了两种不同方法治疗某病的随访资料，现欲比较两法生存率曲线是否有差别，可选择
A. 线性回归
B. χ2检验
C. Z检验
D. t检验
E. l0g-rank检验
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