一般对于一个缺损的生态系统,( )的丧失或改变是影响生态恢复的主要障碍。
A.植物种类
B.动物种类
C.太阳能和水
D.生物种类及其生长介质
参考答案:D
It was dark and I________that woman___________ my mother,for they have the same hairstyle. [ ]
A. mistook ; as
B. mistook ; for
C. took ; as
D. took; for
某男子右手经常麻木,不能抓握,一段时间后手部骨骼肌瘫痪,并出现萎缩现象,这可能是由于 [ ]
A.缺乏体育锻炼
B.深入肌肉的血管中断
C.控制该肌肉的神经手损
D.肌细胞生活的内环境受损