A：0，+∞）
B：（0，e
C：（﹣∞，﹣1
D：（﹣∞，﹣e）
①使用简单的工具 ②脑的发育 ③直立行走 ④用火 ⑤语言的产生 ⑥制造和使用复杂工具．
翻译下列句子。
In my opinion, all Mr White________ good to his students in his class at present. He is very strict in their study.
