下列有关生物体结构层次的叙述不正确的是( ) A . 被子植物没有系统层次 B . 草履虫既是一个细胞又是一个个体 C . “藕断丝连”的“丝”属于输导组织 D . 细胞是所有生物结构和功能的基本单位 答案:DJapan has been trying to bring its nuclear
crisis under ____ control, but ____ spread of radiation has raised concerns
about the safety of the nuclear energy.
A. a; the B.
the; / C.
/; the D. a; /