2. 外语
  3. What does the word "that"(Line2, Para.3) refer to? What has caused Saussures Laniceps to become smaller?

What does the word "that"(Line2, Para.3) refer to? What has caused Saussures Laniceps to become smaller?

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问题 What does the word "that"(Line2, Para.3) refer to?
What has caused Saussures Laniceps to become smaller?
选项 A、Poor soil conditions in the Himalayas.
B、The shortening of flowering period.
C、Tourist selections of seeds of the plants.
D、Reproduction from seeds of the plants.
答案C
解析 推理题。在自然界中，人为的选择也可以使植物进化，人们把最大的雪莲花都摘走了，只剩下小的雪莲得以结子延续物种。
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