1. Which of the following best sums up the whole passage?
A. Malthus′ prediction has been proved to be correct by modern experts.
B. Hydorponics is a new development in agriculture.
C. Hydroponics may be the answer to the world food shortage in the future.
D. Conventional methods of agriculture should be improved so as to step up food production
by two percent every year.
2. The phrase “having outgrown the available food supplies” in the first paragraph implies that .
A. the available food supplies will be enough to feed world population
B. the earth is too exhausted to support its increasing population
C. world, population will grow at a rate faster than food production
D. food supplies will be too much available for world population
3. “Erosion” in the last sentence of the 2nd paragraph probably means .
A. “washing away”
B. “taking away”
C. “digging up”
D. “picking up”
4. Which of the following statements is not true of hydroponics?
A. Hydroponics is still too complicated and expensive for practical use.
B. Hydroponics is considered a revolutionary method of agriculture.
C. Hydroponics has created wonders in agriculture.
D. Hydroponics has already been employed in food production.
5. Judging from the passage, the most important advantage of hydroponics should be
A. higher yield
B. lower labor costs
C. more automation
D. less hard manual work
