题目内容：

    The type of soap with the name African black soap or simply black soap is the one that has its origin in Africa or West Africa to be precise.

The soap is often made by women and is fair-traded, though not always, Black soap is traditionally made in West Africa, typically Ghana, from secret recipes. Different tribes have adopted their own secret making techniques, which can be seen in different colors among black soap. Varieties of black soaps actually made in Africa tend to be pure.

The first step of making traditional African black soap is selecting the plant—usually cocoa pods or palm tree leaves, sometimes shea tree bark (酪脂树皮), which then are sun-dried and burned to ashes which are often used to heal cuts. To guarantee the natural color and light smell, it's important to keep a constant temperature of burning. Then the water is added into the ashes along with the shea butter, palm oil, and coconut oil. That mixture is cooked until it becomes stable. It needs to be hand stirred for at least 24 hours. After that, they scooped it out and let it ''cure'' for two weeks. Those soaps that are made in Africa contain no artificial ingredients (材料).

African black soap is being used for many generations and many causes. African black soap has many benefits over commercially produced soaps. One of the most common usage is to cure skin conditions and problems. After using this soap, the skin looks healthy. Another usage of the black soap is for removing the makeup and dead skin. It also gives an excellent UV (紫外线) protection because of the high level of shea butter in it.

However, the black soap also has some unpleasant side effects. For example, your skin may become over-dried. If so, you should stop using it and wash your skin with water.

1.What leads to color differences of African black soap?

A.Different market demands. B.The makers' personal preferences.

C.Some artificial ingredients. D.Various secret making techniques.

2.What should people do first when making African black soap?

A.Choose the proper plant. B.Change the temperature of burning.

C.Mix coconut oil up for a whole day. D.Dry palm tree leaves for two weeks.

3.What is paragraph 4 mainly about?

A.The benefits of African black soap.

B.The problems caused by black soap.

C.The harm of using African black soap.

D.The process of making African black soap.

4.What do we know about African black soap?

A.It has a strong smell.

B.It's effects are two-edged.

C.It's quite difficult to purchase.

D.It's specially made for women.