文勇的新托福黄金&ccedil

would increase pumping costs at least tenfold

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Unformatted text preview: number of acorns the tree produces 9. According to the passage, oak trees are considered competitors because ○ They grow in areas free of opportunists 135 Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 ○ They spend more energy on their leaves, trunks and roots than on their acorns ○ Their population tends to increase or decrease in irregular cycles ○ Unlike other organisms, they do not need much water or sunlight 10. In paragraph 7, the author suggests that most species of organisms ○ Are primarily opportunists ○ Are primarily competitors ○ Begin as opportunists and evolve into competitors ○ Have some characteristics of opportunists and some of competitors Paragraph 5 在 Opportunists must constantly invade new areas to compensate for being displaced by more competitive species. Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists. █Hence, many of the strongly opportunistic plants are the common weeds of fields and gardens. █ Because each individual is short­lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods. █If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles. █ 11. Look at the four squares █ that indicate where the following sentence could be added to the passage. Such episodic events will cause a population of dandelions, for example, to vary widely. Where would the sentence best fit? 12. Directions: Complete the table by matching the phrases below Directions: Select the appropriate phrases from the answer choices and match them to the type of organism to which they relate. TWO of the answer choices will NOT be used. This question is worth 4 points. Opportunists Competitors Answer Choices ○Vary frequently the amount of energy they spend in body maintenance ○ Have mechanisms for protecting themselves from predation ○Succeed in locations where other organisms have been removed ○Have relatively short life spans ○Invest energy in the growth of large, strong structures ○Have populations that are unstable in response to climate conditions ○Can rarely find suitable soil for reproduction ○Produce individuals that can withstand changes in the environmental conditions ○Reproduce in large numbers 136 Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 在在在在在 ○4 2. ○3 3. ○2 4. ○2 5. ○3 6. ○1 7. ○1 8. ○4 9. ○2 10.○4 11.○3 12.○Opportunists在3, 4, 6, 9 ○Competitors在2, 5, 8 1. 137 Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 在在在在 在在在在在在在在在 在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.

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