题目
How does an early-warning system help us maintain the ecological balance?A. By getting illegal practices under controlB. By stopping us from killing Large predatorsC. By bringing the broken-down ecosystem back to normalD. By signaling the urgent need for taking preventive action.
How does an early-warning system help us maintain the ecological balance?
A. By getting illegal practices under control
B. By stopping us from killing Large predators
C. By bringing the broken-down ecosystem back to normal
D. By signaling the urgent need for taking preventive action.
题目解答
答案
D. By signaling the urgent need for taking preventive action.