根据短文内容和首字母将文章补充完整 (10%) 

Climbing(爬山) is a very healthy s   小题1:. It can make people s   小题2: and healthy. My friend is a very f   小题3: girl and she is very afraid of it. A d   小题4: in a hospital says climbing is g   小题5: for her, so she often goes climbing every Saturday. And now she is very slim and healthy. She still goes climbing now. Do you want to l  小题6: more about the sport? Ok, let me tell you. F   小题7:, you should wear a pair of good shoes. Second, you should have a good r  小题8: before climbing. Last, you should have a good climber in f  小题9: of you, so that the good climber can h  小题10: you if you meet difficulty. Come on, friends. Let’s go climbing at weekends.

常温时，将V₁mL c₁mol·L^－1的氨水滴加到V₂mL c₂moL·L^－1的盐酸中，下列结论中正确的是（  ）

A．若混合溶液的pH=7，则c₁V₁＞c₂V₂

B．若V₁=V₂，c₁=c₂，则溶液中c (NH₄⁺) =c (Cl^-)

C．若混合溶液的pH=7，则溶液中c (NH₄⁺)＞c (Cl^-)

D．若V₁=V₂，且混合液的pH＜7，则一定有c₁ = c₂