① How much is it? ____     A. OK. Here you are.

② Can I try them on? ____     B. It's $89.

③ Is it too expensive? ____     C. It's very pretty.

④ How do you like this skirt? ____     D. Yes，it is.

—You can take             subway to the museum.

—No, I will go there by            bike.

李约瑟说：“宋代理学本质上是科学性的，伴随而来的是纯粹科学和应用科学本身的各种活动的史无前例的繁荣．”材料意在说明理学（　　）