请分析回答：

B)阅读下面对话，在空白处填入恰当的内容。

W: Hello, Lucy speaking.

M:Hi, Lucy. This is Jack. Are you still going to the____ Club?

W: Yes, why?

M: Well, I went to the hospital yesterday, and my doctor suggested I do more exercise.

W: I see. Why not join the club that I'm going to?

M: ____？

W: Yes. Wonderful equipment（器材）, nice people, and it's not far from my home.

M:What do you do there?

W: Well, I often start by running, then swimming.

M: Does the club____training courses?

W: Yes, basketball, tennis, dancing and so on. You have a lot of choices.

M: Sounds great. How often do you go there?

W: Usually twice a week, on Mondays and Thursdays.

M: Not bad. I think I can manage.

W: Hey, I'm going again tonight. Why not____?

M: OK. Where shall we meet?

W:I'll wait for you in front ofmy house at 7:00.

M: ____.

由于____，对畜牧产品需求增加，盲目扩大放养牲畜的数量，致使____，引起____。