A:①③④
B:①②
C:①②③
D:②③④
小周既能给O型血的人输血,又能给AB型血的人输血,小周的血型是____。
— Do you know ________ the population of Shanghai?— Yes, it's over ten million.
读地图,回答问题.
— Now I must go _______ I shall be late for the train. — Have a good trip. Goodbye.