看不懂！？ 4. Scientists analyzing air bubbles that had been trapped in Antarctic ice during the Earth's last ice age found that the ice-age atmosphere had contained unusually large amounts of ferrous material and surprisingly small amounts of carbon dioxide. One scientist noted that algae absorb carbon dioxide from the atmosphere. The scientist hypothesized that the ferrous material, which was contained in atmospheric dust, had promoted a great increase in the population of Antarctica algae such as diatoms Which one of the following, if true, would most seriously undermine the scientist's hypothesis? (A) diatoms are a microscopic form of algae that has remained largely unchanged since the last ice age (B) computer models suggest that a large increase in ferrous material today could greatly promote the growth of oceanic algae (C) the dust found in the air bubbles trapped in Antarctica ice contained other minerals in addition to the ferrous material (D) sediment from the ocean floor near Antarctica reflects no increase, during the last ice age, in the rate at which the shells that diatoms leave when they die accumulated (E) Algae that currently grow in the oceans near Antarctica do not appear to be harmed by even a large increase in exposure to ferrous material
看不出原来题目的逻辑关系。：（
5. Adults who work outside the home spend, on average, 100 minutes less time each week in preparing dinner than adults who do not work outside the home. But, contrary to expectation, comparison show that the dinners eaten at home by the two groups of adults do not differ significantly with respect to nutritional value, variety of menus, or number of courses. Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above? (A) The fat content of the dinners eaten at home by adults who do not work outside the home is 25 percent higher than national guidelines recommend. (B) Adults who do not work the home tend to prepare breakfast more often than adults who work outside the home. (C) Adults who work outside the home spend 2 hours less time per day on all household responsibilities, including dinner preparation than do adults who do not work outside the home. (D) Adults who work outside the home eat dinner at home 20 percent less often than do adults who do not work outside the home. (E) Adults who work outside the home are less likely to plan dinner menus well in advance than are adults who do not work outside the home.
(D) sediment from the ocean floor near Antarctica reflects no increase, during the last ice age, in the rate at which the shells that diatoms leave when they die accumulated
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发表于 2003-8-30 15:00:00
