Many plants could move northward and toward the Pacific coast rising temperatures and changes in rainfall．
A. with regard to
B. in defense of
C. by means of
D. in reaction to
网友回答
A. with regard to
B. in defense of
C. by means of
(答案→)D. in reaction to
解析：句意：许多植物可能北移到太平洋沿岸以应对温度的上升和降水量的变化。with regard to关于；in defense of为保证；by means of借助于；in reaction to应对，选D。