TPO17 Animal Signals in the Rainforest - 英檢

Other species take into account the changing conditions of light by performing their visual displays only when the light is favorable. A male bird of paradise may put himself in the limelight by displaying his spectacular plumage in the best stage setting to attract a female. Certain butterflies move into spots of sunlight that have penetrated to the forest floor and display by opening and closing their beautifully patterned wings in the bright spotlights. They also compete with each other for the best
spot of sunlight.



5. According to paragraph 3, butterflies move into spots of sunlight in order to
○warm their wings in order to open them
○compete with each other
○take advantage of favorable light conditions on the forest floor
○imitate birds of paradise

我選2, 答案是3, 可以理解3比較完整,
2出錯的原因是因為沒說compete for what不夠完整嗎

Very little light filters through the canopy of leaves and branches in a rain forest to reach ground level—or close to the ground—and at those levels the yellow-to-green wavelengths predominate. A signal might be most easily seen if it is maximally bright. In the green-to-yellow lighting conditions of the lowest levels of the forest, yellow and green would be the brightest colors, but when an animal is signaling, these colors would not be very visible if the animal was sitting in an area with a
yellowish or greenish background. The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen. In this part of the rain forest, therefore, red and orange are the best colors for signaling, and they are the colors used in signals by the ground-walking Australian brush turkey. This species, which lives in the rain forests and scrublands of the east coast of Australia, has a brown-to-black plumage with bare, bright-red skin on the
head and neck and a neck collar of orange-yellow loosely hanging skin. During courtship and aggressive displays, the turkey enlarges its colored neck collar by inflating sacs in the neck region and then flings about a pendulous part of the colored signaling apparatus as it utters calls designed to attract or repel. This impressive display is clearly visible in the light spectrum illuminating the forest floor.


According to paragraph 4, what is true about light that reaches ground level?
○It reveals only the yellow and green colors animals use to signal each other.
○It reflects the yellow and green colors to make the floor as bright as sunshine.
○It camouflages animals whose natural colors are yellow and green.
○It consists mostly of yellow-to-green wavelengths


我選3 答案是4. 不明白3錯的原因
因為那算是infer而不是直白的講出來嗎? 題目問的是true not infer?

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