题目详情
单选题 The tundra used to be a carbon sink because _______
A. it supported a variety of animal species
B. it captured huge amounts of carbon dioxide from the atmosphere
C. the temperature is extremely low there
D. the tundra ecosystems are treeless regions

学科:大学英语课程思政示范课
时间:2025-06-18 08:20:05
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