They found __________ impossible to finish so much work in such a short time.
A:that
B:it
C:it is
D: this
如图是人屈肘时上臂的两组肌肉协调活动示意图,此时,肱二头肌和肱三头肌所处的状态分别是( )
如图,在四边形ABCD中,点P是对角线BD的中点,点E、F分别是AB、CD的中点,AD=BC,∠PEF=30°,则∠PFE的度数是( )
组字小魔术。
拾 —扌+ 纟=给— 纟+ ____=____ (拾起)
虹— 虫+ 穴 空—穴+ ____=____(彩虹)