A:点A
B:点B
C:点C
D:点D
化学实验中常常出现“1+1=2”或“1+1≠2”的有趣现象。下列符合“1+1= 2”的事实是( )
如图,扇形折扇完全打开后,如果张开的角度(∠BAC)为120°,骨柄AB的长为30cm,扇面的宽度BD的长为20cm,那么这把折扇的扇面面积为( )
⑴My favourite song is the ABC song.____
⑵Tom goes to the zoo on Saturdays.____
⑶Look at the dog. It's thin.____
⑷The sweater is on the bed.____
⑸—What are they? ____
—They're trees.
A. B. C. D. E.