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  3. A great many creatures have what are called warning colours, that is to say, the colouration warns every creature that the anima

A great many creatures have what are called warning colours, that is to say, the colouration warns every creature that the anima

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问题     A great many creatures have what are called warning colours, that is to say, the colouration warns every creature that the animal in question is dangerous. The skunk(臭鼬) is one of the best (1)_____ of this, with his brilliant black and white fur. He walks (2)_____ even in broad daylight and shows no (3)_____ when he sees you. He heavily (4)_____ his feet and puts his (5)_____ up in the air, daring you not to come (6)_____ closer. And if you don’t take (7)_____ of the warning he will spray you with his evil-smelling (8)_____, and no animal that has been (9)_____ by a skunk will let it happen (10)_____
    In the Reptile House at a zoo you will probably find a case (11)_____ of small tree frogs. Now, a great (12)_____ of creatures like to eat frogs, and so some frogs as a (13)_____ can ooze out a substance on their skin (14)_____ makes them taste horrible. These frogs are generally banded (15)_____ bright warning colours, like orange, red, yellow and bright green. This, of course, makes them (16)_____ like brightly-coloured sweets, and rather good to (17)_____ but the birds and animals in the forest have learnt (18)_____ bitter experience that these frogs are the (19)_____ that tastes the worst, and so they leave them (20)_____.

选项 A、at
B、with
C、in
D、of
答案B
解析 learnwithexperience"有过经验"。
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