A:①是反射弧,②是反射
B:①是反射弧,③是反射
C:②是反射弧,③是反射
D:①是反射,②是反射弧
He held a glass with care because he was afraid of ____ (break) it.
Rt△ABC中,∠C=90°,tanA=35,BC=5,则AB=( )
下列关于人类遗传病的叙述,错误的是( )
—Have you written anything on Chinese traditional medicine so far?— _________, but I have a plan for it.