下列分解因式正确的是
A.﹣a+a3=﹣a(1+a2)
B.2a﹣4b+2=2(a﹣2b)
C.a2﹣4=(a﹣2)2
D.a2﹣2a+1=(a﹣1)2
答案:D
根据首字母提示写单词,完成短文。
Hello, I'm Sonia. I'm a girl. I'm thirteen years old. I'm a middle school
student. My favorite 1.s_____ is English.I have a nice English 2.t_____. She is
Mrs Black. She loves us very much. She is very strict. She likes Beijing
3.O_____. She usually goes to see Beijing Opera on Saturday.She says she can
4.l_____ about Chinese history. Her favorite sport is baseball but she can't
5.p_____ volleyball.
治疗热毒血痢,当首选的药物是()
A.苦参
B.葛根
C.白头翁
D.穿心莲
E.黄柏