[单项选择]

Text 3
Most growing plants contain much more water than all other materials combined. C. R. Bames has suggested that it is .as proper to term the plant a water structure as to call a house composed mainly of brick a brick building. Certainly it is that all essential processes of plant growth and development occur in water. The mineral elements from the soil that are usable by the plant must be dissolved in the. soil solution before they can be taken into the root. They are carried to all parts of the growing plants and are built into essential plant materials while in a dissolved state.
The carbon dioxide (CO₂) from the air may enter the leaf as a gas but is dissolved in water in the leaf before it is combined with a part of the water to form simple sugars -- the base material from which the plant body is mainly built. Actively growing plant parts are generally 75 to 90 percent water. Structural parts of plants, such as wood
A. The mineral elements will not be absorbed by the plant unless they are dissolved in its root
B. The woody stems contain more' water than the leaves
C. Air existing around the leaf is found to be saturated
D. Only part of the carbon dioxide in the plant is synthesized

Text 3
Most growing plants contain much more water than all other materials combined. C. R. Bames has suggested that it is .as proper to term the plant a water structure as to call a house composed mainly of brick a brick building. Certainly it is that all essential processes of plant growth and development occur in water. The mineral elements from the soil that are usable by the plant must be dissolved in the. soil solution before they can be taken into the root. They are carried to all parts of the growing plants and are built into essential plant materials while in a dissolved state.
The carbon dioxide (CO₂) from the air may enter the leaf as a gas but is dissolved in water in the leaf before it is combined with a part of the water to form simple sugars -- the base material from which the plant body is mainly built. Actively growing plant parts are generally 75 to 90 percent water. Structural parts of plants, such as wood
A. a plant efficiently utilizes most of the water it absorbs
B. carbon dioxide is the essential substance needed for plant development
C. a plant needs more water than is found in its composition
D. the stronger the wind, the more the water vapor loss'

Text 3
Much of the American anxiety about old age is a flight from the reality of death. One of the striking qualities of the American character is the unwillingness to face either the fact or meaning of death. In the more somber tradition of American literature -- from Hawthorne and Melville and Poe to Faulkner and Hemingway -- one finds a tragic depth that disguises the surface thinness of the ordinary American death attitudes. By an effort of the imagination, the great writers faced problems that the culture in action is reluctant to face -- the fact of death, its mystery, and its place in the back-and-forth shuttling of the eternal recurrence. The unblinking confrontation of death in Greek time, the elaborate theological patterns woven around it in the Middle Ages, the ritual celebration of it in the rich, peasant cultures of Latin and Slavic Europe and in primitive cultures; these are difficult to find in American life.
Whether through fear of the emot
A. a characteristic of American society.
B. a quality found in all civilizations.
C. a quality inherited from our Latin ancestors.
D. a quality of the American character.

Text 3 Much of the American anxiety about old age is a flight from the reality of death. One of the striking qualities of the American character is the unwillingness to face either the fact or meaning of death. In the more somber tradition of American literature -- from Hawthorne and Melville and Poe to Faulkner and Hemingway -- one finds a tragic depth that disguises the surface thinness of the ordinary American death attitudes. By an effort of the imagination, the great writers faced problems that the culture in action is reluctant to face -- the fact of death, its mystery, and its place in the back-and-forth shuttling of the eternal recurrence. The unblinking confrontation of death in Greek time, the elaborate theological patterns woven around it in the Middle Ages, the ritual celebration of it in the rich, peasant cultures of Latin and Slavic Europe and in primitive cultures; these are difficult to find in American life. Whether through fear of the emotional depths, or
A. In American life, people hardly mention the death.
B. In the Middle Ages, death was surrounded by respect.
C. In primitive cultures, death was faced with awe.
D. In Greek times, people .were afraid of facing death.