第一部分： 阅读理解（共两节，满分40分）
第一节（共15小题，每小题2分，满分30分）
阅读下列四篇短文，从每小题后所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该选项涂黑。
A
With the development of modern society, human beings are increasingly invading wild animals’ habitat as well as the wild plants’. Nearly a third of the world’s cacti (仙人掌 ) are facing the threat of extinction, according to a shocking global assessment of the effects.
