At Spring Festival, we ________ a big family dinner. [ ]
A. has
B. have
C. play
答案:B
One use of networks is to let several computers share ______ such as file systems, printers, and tape drives.
A.CPU
B.memory
C.resources
D.data
下图为哺乳动物某个体内细胞的某些生命活动的示意图。下列说法错误的是()。
A.导致细胞c、e、f多样性的根本原因是DNA分子的多样性
B.细胞b具有分裂和分化的潜能
C.细胞f中同时含有X和Y染色体
D.c和h中染色体数目与细胞b不同