A great advantage of Basin irrigation is that

A. it makes it possible to irrigate larger areas

B. the basin helps to trap much alluvium to enrich the soil

C. it is an expensive means of irrigation

D. water is not wasted

The Gezira scheme and the Manaquil Extension are famous for the cultivation of

A. kolanut

B. cotton

C. sugarcane

D. beans and other legumes

The system of cultivation of tropical commercial crops estates is known as

A. plantation agriculture

B. bush fallowing

C. mixed cropping

D. intensive farming

All the following are problems of mining in Africa except

A. use of obsolete technology

B. inadequate fireign capital

C. shortage of poer

D. inadequate unskilled labour

The most common mode of transportation in Africa is

A. air

B. soil

C. ocean

D. road

The longest river in Africa is River

A. congo

B. zambezi

C. senegal

D. nile

Africa's largest timber producer is

A. Zaire

B. Ghana

C. Nigeria

D. Malawi