Exploring the polar regions is a _______
题型:选择题
问题:
Exploring the polar regions is a _______ issue because it may destroy the ecological environment there. [ ]
A . conventional
B. contradictory
C. contemporary
D. controversial
Exploring the polar regions is a _______ issue because it may destroy the ecological environment there. [ ]
A . conventional
B. contradictory
C. contemporary
D. controversial