It is rather that we still do not know how many species there are in the world today.A. m

问题补充：

It is rather that we still do not know how many species there are in the world today.

A. misleading

B. embarrassing

C. boring

D. demanding

答案：

A. misleading

(答案→)B. embarrassing

C. boring

D. demanding

解析：考查形容词：A.misleading误导的B．embarrassing令人尴尬的C . boring乏味的D．demanding苛刻的，要求高的，句意：我们还不知道现在地球上有多少物种真是令人尴尬的。选B。