如图所示,太阳光与水平面的夹角为60°,利用平面镜将太阳光射入深井中的A处,试在图中画出平面镜应放置的位置,并标明平面镜与水平面的夹角.
—______that makes parents so concerned about choosing a good kindergarten for their kids?
—The expectation of a good education for their kids.[ ]
A. How is it
B. Where is it
C. What is it
D. Why is it
浆细胞是
A.有吞噬功能
B.由T细胞分化来的
C.是产生抗体的细胞
D.与肥大细胞有共同特性
E.是嗜碱性粒细胞