Many people keep food in the fridge for a long time and still eat it. But this habit is not safe at all.

The fridge can only keep food cool. It cannot kill bad germs (病菌). Many dangerous germs can still live and grow in low temperatures (低温). They will make people sick.

1.1. The fridge is to ______ food.

A cool

B kill

C save

D cook

解析：选A。A细节理解题。根据第一段中的“The fridge can only keep food cool.”可知，冰箱是用来降低食物温度的。故选A。

2.2. We clean the fridge to ______ germs from growing.

A stop

B find

C take

D want

解析：选A。A细节理解题。根据第三段中的“First, we should clean the fridge often. It can stop bad germs from growing.”可知，清理冰箱是为了阻止病菌滋生。故选A。

3.3. Putting different food in separate places can stop germs from ______ other food.

A mixing with

B spreading to

C cooking with

D hiding in

解析：选B。B细节理解题。根据第三段的“Second, we must put different food in separate (分开的) places. It can stop germs from spreading to other food.”可知，把食物分开放可以避免病菌传染给其他食物。故选B。

4.4.It is not good to put eggs on the fridge door because eggs will ______ soon.

A become fresh

B get dirty

C turn bad

D stay warm

解析：选C。C细节理解题。根据第三段的“Third, never put eggs in the fridge door. The door opens very often. The temperature there changes a lot, and it will make eggs go bad faster.”可知，把鸡蛋放在冰箱门上面，鸡蛋容易更快“变坏、变质”。故选C。