【题目】This species of plant is becoming increasingly ________, so it’s hard for people to find it.
A. common B. artificial
C. attractive D. rare
在线课程【答案】D
【解析】考查形容词辨析。句意：这种植物变得越来越稀少，所以人们很难发现它。A. common常见的；B. artificial人工的；C. attractive有吸引力的；D. rare稀少的。根据后文it’s hard for people to find it可知，它很稀少，故选D。