题目

写出正确的句子。【1】can super girl paint a picture kitty no she can’t but she can run fast _________________________________________________________________________【2】have an apple please miss fang thank you peter_________________________________________________________________________ 答案：【答案】【1】Can Supergirl paint a picture, kitty? No, she can’t, but she can run fast.【2】Have an apple please, Miss Fang. Thank you, Peter.【解析】略4．（1）已知实数a，b满足0＜a＜b+1，试判断a2-1与b2+2b的大小．（2）已知实数x，y，试判断x2+xy+y2的符号．