关于回肠的叙述,下列错误的是( )
A.是小肠的末段B.管壁较薄,血液供应不如空肠丰富C.黏膜上只有孤立淋巴滤泡D.管腔口径比空肠小E.位居腹腔的右下部
参考答案:C
______is very important for us students to learn English well.
A.As
B.There
C.What
D.It