Official 18 Lec 4
Question 1 of 6
What is the main purpose of the lecture?

A.

To explain the biological advantages of a physical change that occurs in North American wood frogs

B.

To explain why the North American wood frog's habitat range has expanded

C.

To describe the functioning of the circulatory system of the North American wood frog

D.

To introduce students to an unusual phenomenon affecting North American wood frogs

正确答案:D

显示答案
进入答题
00:00
00:00
隐藏原文

译文

精听文本