孟德尔的遗传规律不适合原核生物,原因是()
A.原核生物无核物质
B.原核生物无遗传物质
C.原核生物无完善的细胞器
D.原核生物主要进行无性生殖
参考答案:D
You know ______ you are, ______ mistakes you'll make. [ ]
A. the careful, the few
B. the more careful, the less
C. careful, few
D. the more careful, the fewer
公安机关督察机构设督察长,由同级公安机关领导成员( )担任。
A.副职 B.正职C.挂职 D.专职