6.At first, people raised dogs to help them hunt and to warn them when danger ______ . Today, cats and dogs are kept largely as pets.

　　A.reproached B. approached C.appreciated D. apprehended

　　Best Answer:B

　　詳解：應(yīng)選B項。approach意思是“接近，靠近”;reproach意為“責(zé)備”;appreciate意為“欣賞”;apprehend意為“理解，憂慮”。

　　7.For a child to give up his less mature idea for a more mature one, it requires that the child ______ psychologically really for the new idea.

　　A.would be B. were C.be D. is

　　Best Answer:c

　　詳解：應(yīng)選C項。require要求從句的謂語省略should +動詞原形。

　　8.They do not have to pay for expensive seats at the theater, the cinema or the opera, ______ , perhaps, that show is disappointing.

　　A.only to discover B. only discovering C.only so as to discover D. only for discovering

　　Best Answer:A

　　詳解：應(yīng)選A項。only to do sth意為“結(jié)果只是…”，其邏輯主語是they。

　　9.I ______ admit the truth or your remarks, although they go against my interests.

　　A. can but B. may not to C.can't but D. need but

　　Best Answer:C

　　詳解：應(yīng)選C項。can't but的意思是“不能不”。