The students gradually ______ a knowledge of the subject

The students gradually ______ a knowledge of the subject

1. The students gradually ______ a knowledge of the subject.

A.acquired     

B.attained     

C.achieved     

D.behaves      

.标准答案：A

2. She ought to stop work; she has a headache because she _______ too long.

A.has been reading           

B.had been reading           

C.is reading                 

D.reads                      

.标准答案：A

3. The people in the flood areas are badly in ______ of warm clothes and shelter.

A.shortage     

B.want         

C.supply       

D.plentiful    

.标准答案：B