B……  . discussing the importance of a phenomenon

　　C……  . presenting a possible explanation of a phenomenon

　　D……  . contrasting two schools of thought

　　E……  . discussing the origins of a theory

　　Select and indicate one answer choice from among the choices provided.

　　Question 26.

　　This question has three answer choices, labeled A through C. Consider each of the three choices separately and select all that apply.  The credited response may be one, two, or all three of the choices.

　　Which of the following statements is supported by the passage?

　　A……  . The pull theory is not universally accepted by scientists.

　　B……  . The pull theory depends on one of water's physical properties.

　　C……  . The pull theory originated earlier than did the push theory.

　　Indicate your answer choice or choices.

　　Question 27.

　　This question has five answer choices, labeled A through E. Select and indicate the best answer from among these choices.

　　The passage provides information on each of the following EXCEPT

　　A……  . when the pull theory originated

　　B……  . the amount of water a tall tree can transport

　　C……  . the significance of water's tensile strength in the pull theory

　　D……  . the role of the sun in the pull theory

　　E……  . the mechanism underlying water's tensile strength

　　Select and indicate one answer choice from among the choices provided.

　　Question 28  has five answer choices, labeled A through E, and is based on the following text.

　　Producing and using biodiesel, a fuel derived from cultivated rapeseed, causes 35 percent less air pollution per gallon than does producing and using regular diesel fuel.  The government plans to reduce diesel-related air pollution over the next decade by 25 percent, so replacing regular diesel with biodiesel would seem to be the obvious solution.  Unfortunately, the greatest possible production of biodiesel would amount to only one percent of all diesel fuel to be produced during the next 15 years.

　　Question 28.

　　The passage is structured to lead to which of the following as a conclusion?

　　A…… . The use of biodiesel will increase by less than one percent over the next 15 years.

　　B…… . During the next 15 years, the production of biodiesel will be increased as fast as it is possible to increase it.

　　C…… . During the next 15 years, it will be impossible, just by switching to biodiesel, to meet the government's stated goal with respect to reducing air pollution.

　　D…… . Fifteen years from now, the air pollution caused by the production and use of one gallon of regular diesel fuel will be far less than it currently is.

　　E. . . There will be no significant year-to-year increase in the amount of regular diesel fuel used during the next 15 years.

　　Select and indicate one answer choice from among the choices provided.