Man cannot go on (1) his numbers at the present rate, In the (2) 30 years man will face a period of crisis. (3) experts believe that there will be a widespread food (4) . Other experts think this is (5) pessimistic, and that man can prevent things (6) worse than they are now. But (7) that two-thirds of the people in the world are undernourished or starving now.
One thing that man can do is to limit (8) of babies born. The need (9) this is obvious, but it is (10) to achieve. People have to (11) _ to limit their families. In the countries of the population (12) , many people like big families. The parents think that this (13) a bigger income for the family and ensures there will be someone in the family who will look (14) them in old age.
Several governments have (15) birth control policies in recent years. (16) them are Japan, China,
A. second
B. recent
C. next
D. late
Glass, in one form or another, has long been in noble service to humans. As one of the most widely used of manufactured materials, and certainly the most versatile, it can be as imposing as a telescope mirror the width of a tennis court or as small and simple as a marble rolling across dirt.
41. ______
The uses of this adaptable material have been broadened dramatically by new technologies: glass fiber optics—more than eight million miles—carrying telephone and television signals across nations; glass ceramics serving as the nose cones of missiles and as crowns for teeth; tiny glass beads taking radiation doses inside the body to specific organs; even a new type of glass fashioned of nuclear waste in order to dispose of that unwanted material.
42. ______
On the horizon are optical computers. These could store programs and process information by means of light—pulses from tiny lasers—rather than electrons. And the pulses woul
我来回答:
