( ) Goodbye, Lingling.
A：你好，玲玲。
B：再见，玲玲
观察下列等式：
12=1
12﹣22=﹣3
12﹣22+32=6
12﹣22+32﹣42=﹣10
…
照此规律，第n个等式可为____
一个有凝聚力的班集体的形成，靠的是（ ）
____
读句子，将问句和答句连线。
①What’s the matter?____ A. Thank you.
②Let me help you. ____ B. Me, too.
③I have yellow hair. ____ C. My name is Mike.
④Do you hurt your hand?____ D. Yes, I do.
⑤What’s your name?____ E. I hurt my foot.
They _______ 20,000 yuan for the Project Hope last year.
