在B栏中找出与A栏相对应的答语。（10’）

A                     B

小题1:Where are my books?        A: It’s on the chair.

小题2:Where is his baseball?       B: Yes, it is.

小题3:Are these your keys?         C: This is my uncle.

小题4:Is the hat under the bed?     D: No, she isn’t.

小题5:Who’s this?                 E: They’re in your backpack.

小题6:Is she your mother?         F: It’s next to the door.

小题7:Where’s her sofa? G: No, they aren’t. They’re John’s parents.

小题8:What’s this?                H: Yes, they are.

小题9:Are they your parents?       I: They are his grandparents.

小题10:Who are they?              J: It’s a drawer.

交换性钙离子浓度相同的两种不同土壤，阳离子交换量越大的土壤其钙离子的有效度越大。