【正确答案】 B

【答案解析】[听力原文]
There are different ways to store fish. Two ways to keep fish for future use are canning and freezing. Two other methods are drying and smoking. Today we will introduce how to prepare dried fish. Begin with fish that are just out of the water. If the fish are small, leave their heads on. Cut off the heads if the fish are longer than 20 centimeters or weigh more than 115 grams. Now clean the freshly caught fish, cut off the scales and cut open the stomach to remove everything inside. Then wash the fish in clean water and rub salt into them. Next, put the fish in a container with a solution of 300 grams of salt and one liter of water, which can remove the blood from the meat. After keeping the fish in the saltwater for about 30 minutes, wash them again in clean water. Then, put the fish in a solution that has more salt in the water. The water should be salty enough so that the fish float to the top. Cover the container with a clean piece of wood and place a heavy stone on the wood to hold it down, leaving them there for about six hours. After that, remove the fish from the saltwater and place them on a clean drying table with a clean piece of white cloth covering it. For best results, put the drying table under a tree, turning the fish over every other day. Small fish will dry in about three days if the air is dry while large ones will take a week or ten days to dry.

What does the passage mainly talk about?

[解析] 短文开始提到，储存鱼有不同的方法。两种储存方法是罐装和冷冻，另外两种是干腌和熏制。今天我们讲述任何制作鱼干。由此可见，本文主要介绍如何制作干鱼。

【正确答案】 A

【答案解析】[听力原文]
Why should the fish be kept in the saltwater?

[解析] 短文中提到，要把去除内脏的鱼放入一个装有300克盐和1升水的盐水混合溶液的容器，这样做可以把鱼肉的血清除掉。

【正确答案】 D

【答案解析】[听力原文]
What should we do if the fish sink to the bottom of the container?

[解析] 短文中提到，将鱼放入盐水中30分钟捞出，并放入清水中清洗干净，再将鱼放入浓度更高的盐水中。盐水的浓度要高地足以使鱼漂在水面上。本题问的是如果鱼沉到容器底部怎么办，根据短文内容可知，如果鱼沉在容器底部，说明盐的浓度不够，这时应该做的是在水中在多加盐。

【正确答案】 C

【答案解析】[听力原文]
What can be inferred about drying fish?

[解析] 短文最后提到，为达到最后的效果，应把烘干桌放在树下，而且鱼要隔天翻动一次。由此可以推断，在烘干过程中鱼要远离阳光直射。