2022年自考《综合英语（一）》练习试题2.6

21.There is an image problem with sweet potatoes in Africa because ____.

A.they are very ugly in shape and color

B.they are difficult to grow

C.they are regarded as the food of the poor

D.they do great harm to the land

22.What is true of sweet potatoes in Africa?

A.The white ones had high levels of vitamin A.

B.The commonly-grown ones are low in vitamin A.

C.The yellow ones can make you strong and clear your skin.

D.The orange ones cannot help overcome the lack of vitamin A.

23.In areas without radio,what did Jan Low and her partners do to draw public attention to sweet potatoes?

A.They sang and danced with local people.

B.They drove vehicles in different colors.

C.They dressed themselves in orange.

D.They gave lectures in theaters.

24.According to Mr.Gustafson,some efforts to introduce other nutritious crops to Africa failed because ____.

A.people don’t like them

B.people cannot afford them

C.they don’t taste delicious

D.they have strange colors

25.What is the passage mainly about?

A.The different functions of vitamin A.

B.The introduction of nutritious crops to Africa.

C.The history of growing potatoes in Africa.

D.The most popular food in Africa.