Look at book on the desk . Is it useful one ?--Yes it is . In the book there is muc

问题补充：

--- Look at book on the desk . Is it useful one ?

--Yes, it is . In the book there is much advice on how to learn math well.

A. a, the

B. the, a

C. the, an

D. a, an

答案：

A. a, the

(答案→)B. the, a

C. the, an

D. a, an

解析：句意：看看桌子上的那本书。它有用吗？是的，书里有很多关于学好数学的建议。句中有on the desk限定这本书，用定冠词the,useful有用的，辅音音素发音，用a,故选B