能对细菌内毒素、化学药品、异种蛋白等热源物质产生稳定的发热反应，而用于热源实验的动物

任务型阅读，根据表格内容，完成所给任务（每空一词）
There is a very popular organization with young people in our community. I joined it two years ago. And I have taken part in many interesting activities. What we have done can not only help others but also make ourselves happy.
Last Sunday, we went to an old people’s home. After helping them do some housework, we sang, danced and played games with them. The old people were excited at our visit. They told us interesting stories about themselves. We all had a good time.
After this visit, my friend and I decided to do more things to help them. Now more than 30 volunteers have joined our club. Everyone thinks the experience is wonderful.

How	The organization is very   小题1: with young people in their community.
When	The writer joined it   小题2: years ago.
What	They sang,  小题3: and played games with the old people there.
How	The old people were   小题4:  at their visit.
How many	More than  小题5: volunteers have joined their club.