Acomputeris-----usefultoolin------worldtoday.A.an;theB.a;theC.the;thAcomputerisusefultoolinworldtoday.A.an;theB.a;theC.the;theD.a;a

Question

A computer is----- useful tool in ------ world today. A. an; the B. a; the C. the; th
A computer is useful tool in world today.
A. an; the B. a; the C. the; the D. a; a

Answer 1

A computer is （a） useful tool in （the） world today.
如今的世界,一台电脑就是一个有用的工具.
第一空是泛指,表示“一个,一种”.第二空是特指,the world,指我们所生活的这个世界.
所以选择B项.