肾窦回声包括的结构有（）。

A.肾盂、肾盏、肾血管和脂肪组织

B.肾实质

C.肾锥体

D.肾脂肪囊

E.以上均是

用关系代词或关系副词将下列每对句子连成一个复合句（5%）

小题1:The boy is my younger brother. He was here a minute ago.

小题2:The old man is a professor. He teaches chemistry in a college.

小题3:Beijing Hotel is near Tian An Men Square. The foreign visitors live there.

小题4:The woman is here now. You were talking about her.

小题5:This is the hall. We listened to the report in it the other day.