一Why do you get up so early in the morning,Tracy?
--I generally make it a to be up by 7 am to read English.
A:plan
B:wish
C:secret
D:rule
多音字组词
种zhǒng____ zhòng ____
分fēn ____ fèn ____
斜三棱柱ABC﹣A1B1C1中,AA1=AC=BC=2,∠A1AC=∠C1CB=60°,且平面ACC1A1⊥平面BCC1B1,则A1B的长度为____.