我国学前教育是具有强正外部效应的公共产品。
A. 对
B. 错
福禄贝尔创办了世界上第一所以幼儿园命名的学前教育机构。
A. 对
B. 错
Write down the past forms of the verbs.(写出下列动词的过去式形式。)1 touch __________2 stay __________3 cry __________4 go __________5 have __________6 come __________
Fill in the blanks with the correct forms of the verbs in brackets.(用括号中动词的适当形式填空。)1 Mary ___________ (come) to China last month.2 There _________ (be) a telephone call for you just now.3 I listened but ___________ (hear) nothing.4 Mike _____________ (not go) to bed until 12 o’clock last night.