托福听力tpo11 Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Gustave Kramer conducted important research related to the ability of birds to orient and navigate. 答案解析【小站备考】

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14.Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
Gustave Kramer conducted important research related to the ability of birds to orient and navigate.

Because caged birds become disoriented when the sky is overcast, Kramer hypothesized that birds orient themselves according to the Sun's position.

In one set of experiments, Kramer placed the box containing food at the same point of the compass each time he put food boxes in the birds’ environment.

Kramer demonstrated that an internal biological clock allows starlings to compensate for the Sun's movement.

After several studies, Kramer surmised that an internal biological clock allows some species of birds to navigate at night.

The role of environmental cues in birds' navigation is clear, for on overcast days, birds use objects besides the Sun to orient themselves.

Kramer showed that night-migrating birds use the sky to navigate by the stars.

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正确答案：ACF

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A选项：because选项对应原文第三段第四句，正确。 B选项：in one set选项与原文第四段首句相反，不选。 C选项：Kramer demonstrate选项对应原文第五段后两句，正确。 D选项：after several选项与原文第六段最后一句相反，不选。 E选项：the role选项原文没说，不选。 F选项：Kramer showed选项对应原文第六段最后一句，正确。

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