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]
1. Which of the following km r,m(sc -ul0are involved4e :4 j qkwqi*79mrvlg in the return of blood to the heart in theq4rjq94l wgmv7ek: i * veins?
I. The pumping action of the heart.
II. Valves.
III. Skeletal muscle contraction.
IV. Peristalsis.
A. I only
B. II, III and IV only
C. II and III only
D. I, III and IV only
参考答案: C
本题详细解析:
暂无
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