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ETS官方托福样题阅读部分：机会主义者和竞争者

2015-07-17 15:56:52来源：网络

　　Paragraph 7 is marked with an arrow .

　　9. According to the passage, oak trees are considered competitors because

*　　they grow in areas free of opportunists
*　　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 7 is marked with an arrow .

　　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?

　　Click on a square to add the sentence to the passage.

　　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.

　　Drag your answer choices to the spaces where they belong. To remove an answer choice, click on it. To review the passage, click on View Text.

Answer Choices

Opportunists

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


Competitors

Can rarely find suitable soil for reproduction


Produce individuals that can withstand changes in the environmental conditions


Reproduce in large numbers


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