植物激素和植物生长调节剂最根本的区别是[ ]
A.二者的分子结构不同
B.二者的生物活性不同
C.二者合成的方式不同
D.二者在体内的运输方式不同
答案:C
It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.
A.that
B.what
C.which
D.where
如图所示,在胆红素的肠肝循环中,小部分尿胆原由肠吸收后经由何种解剖结构回到肝中()
A.肝动脉
B.肝静脉
C.门静脉
D.左肝管
E.右肝管