He asked several questions_______ the professor who gave us a lecture_______the balance of nature.

　 A. with; for 　 B. from; of  C. to; about 　 D. of; on

He asked several questions_______ the professor who gave us a lecture_______the balance of nature.

A. with; for 　 B. from; of　　 C. to; about 　 D. of; on

They are fighting ________ us ________ the enemy.

A．with; against 　　　　 B．for; against

C．with; for 　　　 D．against; for

The meeting was concerned ______ reforms and everyone present was concerned　　　　　 their own interests.

A. with; for 　　　 B. for; which 　　 C. for; about　 　　 D. about; with

He asked several questions ________ the professor who gave us a lecture ________ the balance of nature.

　 A. with; for 　 B. from; of

　 C. to; about 　 D. of; on