Marking Earth Day with his plan for energy．President Barack Obama on Wednesday calle

问题补充：

Marking Earth Day with his plan for energy．President Barack Obama on Wednesday called for energy exploration.

A. alternative

B. traditional

C. available

D. inexpensive

答案：

(答案→)A. alternative

B. traditional

C. available

D. inexpensive

解析：可联系答.案.网客服索取。