One day, Pierre, ____ worked in a government office, received an ____ (invite) to a palace ball. His wife, Mathilde, had no money ____ (buy) jewellery, so she borrowed a ____ (beauty) necklace(项链) from ____ (she) friend, Jeanne. She looked very beautiful. And they had ____ wonderful time that evening.

    But after the ball, she ____ (find) the necklace missing. They had to borrow a lot of money to buy a new one for Jeanne. In order to pay back the money, they worked day and night ____ 10 years. Mathilde became very old, so Jeanne didn't recognize her when they met in a park 10 years ____ (late). From this story, we know a person shouldn't be affected by vanity(虚荣心), ____ it will cost him a lot.

暴露在空气中的食品比真空包装的食品容易腐败变质；生猪肉比煮熟的猪肉容易腐败变质；加盐腌制的鱼比鲜鱼存放时间长．

（1）通过上述资料，你提出的问题是：　____ 

（2）根据你提出的问题，请你作出相应的假设：____ 

（3）小亮同学设计了一个实验方案：取三支试管，编号并做以下处理：

本方案中1号试管能与____ 号试管形成一组对照实验；3号试管能与____ 号试管形成一组对照实验．

（4）随着时间的推移，你认为最先发出臭味的是____ 号试管，最后发出臭味的是____ 号试管．

（5）通过上述实验可知，在____ 条件下保存食品的时间较长，因为在这种温度下微生物的____ 和____ 受到抑制．

（6）通过上述探究实验，请你写出两种保存食品的方法．____ 和____ ．

人的身体各部分能协调活动，主要靠神经系统的调节作用．下列描述错误的是（　　）