Li Lei can _____ English.But his brother can't.[ ]
A. tell
B. talk
C. say
D. speak
答案:D
翻译下列句子。
1. That's not funny.
______________________________________
2. You don't have money.
3. Tim, wash your socks!
4. Breakfast is ready.
5. Open your mouth.
获得守恒性和可逆性概念是在哪一阶段()
A.感知运算阶段
B.前运算阶段
C.具体运算阶段
D.形式运算阶段