生活即化学,生活中有很多的变化都蕴含着化学原理,下列变化属于化学变化的是[ ]
A.冰雪消融
B.食物腐败
C.空气流动
D.瓷器破碎
答案:B
Hello, boys and girls! My name is Dick. I’m a boy. I’m a robot (机器人). Please look here. These are my hands. My arms are long. I have no hair. This is my face. It’s round. I have two big eyes , a long nose and a ____________ (宽的) mouth. Here are my big ears. I have short legs and two big _ _______ (foot的适当形式). I can walk(步行). I can speak Chinese, but I can’t speak English. I’m your good friend.
任务一:按括号内的要求填空。
小题1: 。
小题2: 。
任务二:完成句子,每空一词。
小题3:Dick’s is big.
小题4:Dick can speak .
任务三:从文中找出一组反义词。
小题5: , 。
红细胞血型中较为复杂的遗传多态性血型系统是()
A.ABO血型系统
B.Rh血型系统
C.MN血型系统
D.Kell血型系统
E.P血型系统