1. How many diseases are known to attack wheat?

　　A. Around 30, 000.

　　B. Around 140.

　　C. Around 29, 960.

　　D. Around 40.

　　2. According to this passage, which of the following would a plant disease result in if left unchecked?

　　A. A world war.

　　B. Border conflicts.

　　C. Rations of grain and meat.

　　D. Social upheavals.

　　3. What is the main idea of the second paragraph?

　　A. Some plants have relative immunity to a great many diseases, while others have a susceptibility to them.

　　B. The tolerance of a particular plant changes as the growing conditions change.

　　C. A blight killed virtually every chestnut tree in North America.

　　D. A blight may be a national infection.

　　4. According to the passage, some plant diseases can be prevented by

　　A. killing parasites.

　　B. inoculation.

　　C. killing insects.

　　D. improving growing conditions.

　　5. Which of the following statements is not true?

　　A. Some plant diseases may be caused by bacteria.

　　B. Some plant diseases may be caused by pathogens.

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