SL/HL Topic B 3.2 Transport (id: 57a89c119)

本题目来源于试卷: SL/HL Topic B 3.2 Transport，类别为 IB生物学

[单选题]
3. Which is the best descr6lnns e pa of, 9:hng8uy3cu**iption of t(xwn1 dku9h6 ma;mvx2 + umuj(he blood flow in a vein?

A. Blood flow is regular and towards the heart
B. Blood flow is irregular and towards the heart.
C. Blood flow is controlled by veins.
D. Blood flow is rapid and pulsar.


参考答案:  B


本题详细解析: 暂无

微信扫一扫，分享更方便