1、A variety of small clubs can provide _____ opportunities for leadership, as well as for practice in successful group dynamics.

　　A.durable　　B.excessive　　C.surplus　　D.multiple

　　2、By turning this knob to the right you can _____ the sound from this radio.

　　A.amplify　　B.enlarge　　C.magnify　　D.reinforce

　　3、Under the _____ confronting them it was impossible to continue the strike any longer.

　　A.surroundings　　B.settings　　C.circumstances　　D.environments

　　4、We shall probably never be able to _____ the exact nature of these sub-atomic particles.

　　A.assert　　B.impart　　C.ascertain　　D.notify

　參考答案：

　　1、D　2、A　3、C　4、C