11 The food is insufficient for three people

　　A scarce

　　B  short

　　C marginal

　　D  inadequate、

　　12 Most of the butterflies perish in the first frosts of autumn

　　A die

　　B disappear

　　C migrate

　　D  vanish

　　13 But ultimately he gave in.

　　A  undoubtedly

　　B  certainly

　　C  finally

　　D  necessarily

　　14 It is a complicated problem.

　　A strange

　　B complex

　　C  difficult

　　D unusual

　　15 In Britain and many other countries appraisal is now a tool of management-

　　A evaluation

　　B production

　　C efficiency

　　D publicity