A:Failing in the test
B:He failed in the test
C:Because he failed in the test
D:To fail in the test.
Look at this desk. It's Jim's desk. It's brown. Jim's book is on it. The book is his English book. His pencil-box is on it, too. His pencil is in his pencil-box. But where's his pen? He can't find(找到) it.
①AD=BD;②∠MAN=90°;③ AM^ = BM^ ;④∠ACM+∠ANM=∠MOB;⑤AE= 12 MF.
其中正确结论的个数是( )
对下列各图所表示的生物学意义的描述,正确的是: