—What are those?-- are baseballs.A. ThoseB. ThatC. ItD. They

问题补充：

—What are those?-- are baseballs.

A. Those

B. That

C. It

D. They

答案：

A. Those

B. That

C. It

(答案→)D. They

解析：代词辨析。Those这些；Tha那个； It它； They他们。句意：这些是什么：他们是棒球。结合语境可知下文代词指代上文的those，故选D。