TPO17 ANIMAL SIGNALS IN THE RAIN FOREST - 英檢

想請教該文中一個很tricky的INFER題：

Paragraph 4: 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.




Q9. Which of the following can be inferred from paragraph 4 about yellow and
green colors compared with red and orange colors at the bottom of the forest?
○Yellow and green are better colors for signaling than red and orange
colors.
○Orange and red are brighter colors than yellow and green.
○Yellow and green are likely to be more common in the background than red
and orange.
○Orange and red colors do not contrast as well with the forest floor as
yellow and green do.




我的判斷是根據文中的
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. 的前後文

所以我選擇A

但是正解為C

可是我覺得C根本不叫暗示，在該段第一句就說了
"those levels the yellow-to-green wavelengths predominate"

不知做過該篇的大大有沒有這樣的問題？？

在下先謝過了~~

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