填入适当的句子，补全对话。

A: 1________, OK?

B: Sorry, Bob, I don't have a volleyball. But I have a baseball.

A: I don't want to play baseball. 2________? Do you know?

B: Maybe Eric has one. Let's go and ask him.

A&B: 3________, Eric?

C: Yes, 4________. But it's at home.

A: I'm sorry to hear that.

B: Well. Let's play football, OK?

C: 5________. Let' go and join them, Bob.

A: OK. Let's go.

下列除哪项外是多发性硬化治疗的主要目的（）

A.使神经功能障碍得到改善最终完全恢复

B.抑制炎性脱髓鞘病变进展

C.防止急性期病变恶化及缓解期复发

D.晚期采取对症和支持疗法，减轻神经功能障碍带来的痛苦

E.避免可能促使复发的因素