9.The childs abnormal behavior puzzled the doctor.

　　A）bad

　　B） frightening

　　C）repeated

　　D）unusual

　　10.There is an abundant supply of cheap labor in this country.

　　A）a steady

　　B）a plentiful

　　C）an extra

　　D）a meager

　　11.In order to improve our standard of living，we have to accelerate production

　　A）step up

　　B）decrease

　　C）stop

　　D）control

　　12.Gas does accumulate in the mines around here.

　　A）increase

　　B）spread

　　C）collect

　　D）grow

　　13.Our plan is to allocate one member of staff to handle appointments.

　　A）assign

　　B）persuade

　　C）ask

　　D）order

　　14.Her behavior is extremely childish.

　　A）simple

　　B）immature

　　C）beautiful

　　D）foolish

　　15.We also want to use the water to irrigate barren desert land.

　　A）hairless

　　B）bare

　　C）empty

　　D）bald