下面这段文字有三句话，各有一处语病，请加以修改。(3分)

①今年入春以来，浙江遭遇春汛、浮尘、倒春寒等先后异常天气。②气象部门预测，今年的杭州属于气象灾害偏重年份，接下来的日子，梅汛期、高温干旱期、台汛期相继到来，集中降水、台风、雷暴对杭州的影响可能比往年大。③为此，相关部门发出了“江河不决口、水库不垮坝、城镇不进水、人员不死亡”的防汛目标。

—We're doing a lot to protect our environment, but it is not good enough.

—So we should try ______ to look after it. [ ]

A. hard

B. harder

C. hardest

D. hardly