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

參考答案:11.D 12.A 13.C 14.B 15.A