Woman: I paid 50 dollars for these books at the Eaglewood Bookstore. They’re really too expensive.
Man: Too expensive They cost a lot more in other bookstores.
Question: What does the man mean().

A. He thought they were expensive.

B. He didn’t think they were expensive.

C. He wanted the woman to buy books in other bookstores.

D. He thought books in other stores were just as expensive.

跳汰分选钻石的介质是（）。

A.水

B.重液

C.油液

D.蜡液