单项选择题 The author of the passage puts the word "savage" and "barbarian" (lines 9-10) in quotation marks most probably in order to

单项选择题 Current estimates put thirteen percent of global flora at risk of extinction, but this number does not include______plants from tropical regions, where the majority of the world’s plants grow.

单项选择题 Although scientists have______long the human appendix as______organ, there is a growing body of evidence indicating that the appendix does in fact have a significant function as a part of the body’s immune system.