| Obviously, the per capita income of a
country depends on many things, and any statistical test that does not take
account of all important determinants is misspecified, and thus must be used
only for descriptive and heuristic purposes. It is nonetheless interesting--and
for many people surprising--to find that there is a positive and even a
statistically significant relationship between these two variables: the greater
the number of people per square kilometer the higher the per capita
income. The law of diminishing returns is not invariably true. It would be absurd to suppose that a larger endowment of land ipso facto makes a country poorer. This consideration by itself would, of course, call for a negative sign on population den A. for reasons of English language style. B. because of personal reason of style. C. in order to highlight their importance. D. to help the reader avoid confusion. [单项选择]If the diameter of a circle is 14, then the area of the circle is （）.
A. 7π B. 14π C. 28π D. 49π E. 196π [单项选择]If the area of a circle is 81π, then the diameter of the circle is （）.
A. 9 B. 18 C. 36 D. 9π E. 18π [单项选择]A client who has stress incontinence has been given a pamphlet that describes Kegel exercises. Which of the following statements indicates that the client has understood the instructions in the pamphlet
A. "It will probably take a year before the exercises are effective. " B. "I should perform these exercises every evening. " C. "I can do these exercises sitting up, lying down, or standing. " D. "I need to tighten my abdominal muscles to do these exercises correctly. " 我来回答: 提交
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