[填空题]Many plant foods provide both many vitamins and minerals of very few calories.

[填空题]Many plant foods provide both many vitamins and minerals of very few calories.

[单项选择]Vitamins do not provide energy, nor do they construct or build any part of the body. They are needed for ______ foods into energy and body maintenance.
A. transforming
B. transferring
C. altering
D. shifting

[填空题]Many experts who favor genetically modified foods believe that genetic engineering can help to meet the demands of the world’s increasing population.

[单项选择]Many plant varieties used in industrially developed nations to improve cultivated crops come from less-developed nations. No compensation is paid on the grounds that the plants used are "the common heritage of humanity." Such reasoning is, however, flawed. After all, no one suggests that coal, oil, and ores should be extracted without payment.
Which of the following best describes an aspect of the method used by the author in the argument above
A. The author proceeds from a number of specific observations to a tentative generalization.
B. The author applies to the case under discussion facts about phenomena assumed to be similar in some relevant respect.
C. A position is strengthened by showing that the opposite of that position would have logically absurd consequences.
D. A line of reasoning is called into question on the grounds that it confuses cause and effect in a causal relation.
E. (E) An argument is analyzed by separating statements of fact from individual value judgments.

[单项选择]To many environmentalists, the extinction of plants—accompanied by the increasing genetic uniformity of species of food crops—is the single most serious environmental problem. Something must be done to prevent the loss of wild food plants or no-longer-cultivated food plants. Otherwise, the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight. In 1970, for example, southern leaf blight destroyed approximately 20 percent of the United States corn crop, leaving very few varieties of corn unaffected in the areas over which the disease had spread. Which of the following can be inferred from the passage above
A. Susceptibility to certain plant diseases is genetically determined.
B. Eighty percent of the corn grown in the United States is resistant to southern leaf blight.
C. The extinction of wild food plants can in almost every case be traced to destructive plant diseases.
D. Plant breeders focus on developing plants that are resistant to plant disease.
E. (E) Corn is the only food crop threatened by southern leaf blight.

[单项选择]How many people are directors of both Company K and Company R ？（）
(1)There were 17 directors present at a joint meeting of the directors of Company K and Company R, and no directors were absent,
(2)Company K has 12 directors and Company R has 8 directors.
A. 条件(1)充分，但条件(2)不充分．
B. 条件(2)充分，但条件(1)不充分．
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D. 条件(1)充分，条件(2)也充分．
E. 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

[单项选择]Both plants and animals of many sorts show
remarkable changes in form, structure, growth
habits, and even mode of reproduction in becom-
Line ing adapted to different climatic environment,
(5) types of food supply, or mode of living. This
divergence in response to evolution is commonly
expressed by altering the form and function of
some part or parts of the organism, the original
identity of which is clearly discernible. For
(10) example, the creeping foot of the snail is seen in
related marine pteropods to be modified into a
flapping organ useful for swimming, and is
changed into prehensile arms that bear suctorial
disks in the squids and other cephalopods. The
(15) limbs of various mammals are modified according
to several different modes of life—for swift run-
ning (cursorial) as in the horse and antelope, for
swingi
A. Adaptive Divergence
B. Evolution
C. Unusual Structures
D. Changes in Organs
E. (E) Our Changing Bodies

[单项选择]Both plants and animals of many sorts show remarkable changes in form, structure, growth habits, and even mode of reproduction in becoming adapted to different climatic environment, types of food supply, or mode of living. This divergence in response to evolution is commonly expressed by altering the form and function of some part or parts of the organism, the original identity of which is clearly discernible. For example, the creeping foot of the snail is seen in related marine preemptors to be modified into a flapping organ useful for swimming, and is changed into prehensile arms that bear sartorial disks in the squids and other cephalopods. The limbs of various mammals are modified according to several different modes of life—for swift running (cursorial) as in the horse and antelope, for swinging to several different modes of life—for swinging in trees (arboreal) as in the monkey, for digging ( fossorial ) as in the moles and gophers, for flying (volant) as in the bats, for swimmin
A. altered
B. corresponding
C. divergent
D. mammalian