A:a very small car
B:too small a car
C:a too small car
D:such a small car
如图,在下列条件中:①∠DAC=∠ACB;②∠BAC=∠ACD;③∠BAD+∠ADC=180°;④∠BAD+∠ABC=180°.其中能使直线AB∥CD成立的是____ .(填序号)
血液属于哪种组织 ( )