a．and as a result it multiplied

b．in order to multiply

c．so that it might multiply

d．because it multiplied

6  It______ and caused devastation．(1.3)

a．burrowing

b．burrowed

c．was burrowing

d．has burrowed

7  ______ were local epidemics created? By infecting animals．(1.6)

a．Why

b．How

c．Where

d．When

8  It was ______ to create local epidemics of this disease．(11.6-7)

a．potent

b．able

c．enabled

d．possible

Vocabulary  词汇

9  It caused devastation by ______ the herbage．(11.3-4)

a．burrowing into

b．infecting

c．consuming

d．digging

10  By infecting animals and ______them loose in burrows ..．(1.6)

a．allowing

b．leaving

c．introducing

d．turning

11  The rabbits were able to ______this disease to a certain extent．(1.10)

a．react to

b．prevent

c．withstand

d．oppose

12  Australia ______the rabbit as a pest from Europe．(1.13)

a．inherited

b．obtained

c．assumed

d．claimed