8,4,2,1,( )
A.-2
B.-1
C.1/2
D.0
参考答案:C
After the long journey, the three of them went back home,__________.[ ]
A. hungry and tiredly
B. hungry and tired
C. hungrily and tiredly
D. hungrily and tired
细胞壁、细胞膜、细胞质和细胞核均是由原生质特化而来。