下面是在某小水塘中发现的物体或物质,请选出全部是生物的一项:①水②石块③泥沙④水草⑤青蛙⑥小鱼 [ ]
A.①②③
B.④⑤⑥
C.①③⑤
D.②④⑥
答案:B
The sandstorm _ for several days,which left a terrible sight across the west.
A.kept off
B.kept away
C.kept back
D.kept up
使前臂旋前的脊神经是()
A.C5
B.C6
C.C5~6
D.C6~8
E.C7~8