用适当的句子补全对话。

Jack: Good morning, Betty! 1._____

Lucy: We're raising money for Hope School. 2._____

Jack: No.What is a Hope School?

Lucy: It's a school for poor children.And Project Hope has built many schools.

Jack: 3._____ Tell me more about it.

Lucy: 4._____

A. That sounds interesting.

B. What are you doing?

C. Have you been to a Hope School?

D. No problem.

已知在100 ℃的温度下，水的离子积K_W=1×10^-12。本题涉及的溶液，其温度均为100 ℃，下列说法中正确的是（   ）

A．0.005 mol·L^-1的H₂SO₄溶液，pH=2

B．0.001 mol·L^-1的NaOH溶液，pH=11

C．0.005 mol·L^-1的H₂SO₄溶液与0.01 mol·L^-1的NaOH溶液等体积混合，混合溶液的pH为6，溶液显酸性

D．完全中和pH=3的H₂SO₄溶液50 mL，需要pH=11的NaOH溶液50 mL