A:the; 不填
B:the; the
C:不填; 不填
D:the ; a
Results of not enough sleep
harm your problem-solving ____
____ your heart
lead to ____sleepiness
Ways to get better sleep
limit wine drinking ____ to bedtime
get ____ minutes of sunlight
如图1,已知AC是矩形纸片ABCD的对角线,AB=3,∠ACB=30°,现将矩形ABCD沿对角线AC剪开,再把△ABC沿着AD方向平移,得到图2中A′B′C′,当四边形A′ECF是菱形时,平移距离AA′的长是( )