1.Penicillin,(),kills a broad spectrum of bacteria, many of which cause disease in humans. a. the first antibiotic to be discovered b. when the first antibiotic to be discovered c. the first antibiotic that discovered d. was the first antibiotic to be discovered
2.the outstanding feature of copper and the other metals of Group IB in the Periodic Table is () chemical attack. a.resists b. to resisting c.their resistance to d.by resistance
3. Alpha rhythm , a brain (wave) frequency of moderate voltage, is (characteristic) of a person (when) is awake but (relaxed) b有没有问题,好像没有限定词啊
4. Poet Amy Lowell (began) her career (by publishing) the conventional volum A Dome of many-coloured Glass, (despite) eventually succeeded Ezra Pow (as) leader of the progressive imagists. d有没有问题,leader是不是需要限定词