69. From the passage, we understand that the Sahara is... A) a desert which is smaller than the country of Portugal
B) supplying both sides of the Mediterranean Sea with power
C) being explored by scientists for its marvelous scenery
D) likely to solve energy problems of the European continent
70. The author discusses this issue in order to explain... A) extremely hot weather of the Sahara desert
B) what a huge power base the Sahara desert is
C) the work of solar plants existing in the Sahara
D) the amount of electricity Europe gets from the Sahara