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单项选择题

College professor: College students do not write nearly as well as they used to. Almost all of the papers that my students have done for me this year have been poorly written and ungrammatical.
Which one of the following is the most serious weakness in the argument made by the professor

A．It requires confirmation that the change in the professor’s students is representative of a change among college students in general.
B．It offers no proof to the effect that the professor is an accurate judge of writing ability.
C．It does not take into account the possibility that the professor is a poor teacher.
D．It fails to present contrary evidence.
E． It fails to define its terms sufficiently.
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单项选择题Dear Editor: Jones’s new book has the potential to destroy reputations of persons who have held high governmental responsibility during national crises. However, readers should dismiss Jones’s criticisms. Jones’s antigovernment attitude is well known, and his criticisms will convince only those like himself, persons who have never had real responsibility and never will, and hence are not qualified to judge. The argument above includes which of the following questionable techniques

A．It employs the term "responsibility" in more than one sense.
B．It assumes that attacking the source of a claim is sufficient to disprove the claim.
C．It assumes that the majority of people share Jones’s attitude of opposition to government policies.
D．It appeals to a person of unreliable authority as a supporter of its position.
E． It confuses cause and effect.

单项选择题Experienced gardeners advise against planting snap peas after late April because peas do not develop properly in warm weather. This year, however, the weather was unusually cool into late June, and therefore the fact that these snap peas were planted in mid-May is unlikely to result in crop failure despite the experts’ warnings. The pattern of reasoning displayed above is most closely paralleled in which one of the following

A．According to many gardening authorities, tomatoes should not be planted near dill because doing so is likely to affect their taste adversely; however, since these tomatoes were grown near dill and taste fine, there is clearly no reason to pay much attention to the so-called experts’ advice.
B．Since African violets do not thrive in direct sunlight, it is said that in this region these plants should be placed in windows facing north rather than south; however, since these south-facing windows are well shaded by evergreen trees, the African violets placed in them are likely to grow satisfactorily.
C．Where flowers are to be planted under shade trees, gardening expertsoften advise using impatiens since impatiens does well in conditions of shade; however, it is unlikely to do well under maple tree since maple tree roots are so near the surface that they absorb all available moisture.
D．Most seeds tend to germinate at much higher rates when planted in warm soil than when planted in cold soil; spinach seeds, however are unlikely to germinate properly if the soil is too warm, and therefore experts advise that spinach should be planted earlier than most vegetables.
E． House plants generally grow best in pots slightly larger than their existing root systems, so the usual advice is to repot when roots first reach the sides of the pot; this rule should not be followed with amaryllis plants, however, because they are likely to do best with tightly compressed roots.