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题型:阅读理解-阅读单选 难度:0.85 引用次数:185 题号:14584006

Assassin (暗杀者) bugs live up to their name. The insects expertly hunt and feed upon other small invertebrates (无脊椎动物), giving them a poisonous bite. Some species even hunt spiders and use a strange trick to gain the upper hand.

Using their antennae (触须), assassin bugs tap spiders, which appears to confuse them long enough to let the bugs make a poisonous strike, researchers reported on September 29. The findings provide insight into some of the complex hunting tactics that predators (捕食性动物) evolve when targeting dangerous prey (猎物) .

Assassin bugs spend their lives in a place most insects avoid: spider webs. The bugs silently creep along the spider’s silk, taking care to make their movements seem harmless before violently killing the web’s architect, seizing the spiders with their front legs and injecting them with poison.

While watching two species of assassin bugs hunt spiders, ecologists Anne Wignall and Fernando Soley took note of the bugs’ habit of lightly knocking their antennae on spiders once the bugs were within striking distance.

“It struck us early on that tapping prey was a really strange thing to do,” says Wignall. Spiders could easily defend themselves and kill the bugs. “Watching the bugs spend so much time and effort on avoiding detection, only to practically tap the spiders on the shoulder was absolutely fascinating.”

To figure out why the bugs tap, Wignall and Soley tested the behavior of 30 spiders in the laboratory. The researchers copied the bugs’ antennae tapping by gently brushing the spiders’ leg with a dog hair. After the tapping, the team measured the spiders’ responses to movements on the web, copying a struggling insect.

Tapped spiders were far less aggressive than those that weren’t tapped, fully ignoring the movements four times as often. Tapped spiders also attacked about 25 percent as often as their untapped counterparts.

Wignall thinks that the assassin bugs are reducing spiders’ aggression levels by imitating the types of physical touch that these typically solitary (独处的) spiders experience near fellow spiders. “Whenever they do come across another spider, it’s usually because it’s a close relative in the nest, or a potential mate. Both of which are situations in which aggression would not be a good idea,” she says.

Zoologist Ondřej Michálek, who was not involved with the study, says that the researchers have a “completely valid theory.” Many spiders avoid cannibalism (同类相食) by using special touch signals that could be copied by skilful predators, thus tricking the spiders, he says.

1. What is unusual about assassin bugs?
A.Their bite is poisonous.B.Their movements make little noise.
C.They don’t avoid spiders’ webs.D.They kill their prey violently.
2. What surprised Wignall about the bugs’ behavior?
A.They used a great deal of time and effort.B.They were able to defend themselves.
C.They deliberately touched the spiders.D.They were able to kill the spiders.
3. Why do the bugs tap the spiders?
A.They are keen on physical touch.B.They are pretending to be spiders.
C.They are usually solitary.D.They are looking for a mate.
4. What is the best title for the passage?
A.Why animals use complex hunting tactics.B.Why assassin bugs tap their prey.
C.Assassin bugs have a poisonous bite.D.Assassin bugs-a dangerous predator.
【知识点】 动物 科普知识 说明文

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【推荐1】If you have ever had a cat, or have watched one of the many funny cat videos online, you’ll know that cats have a mind of their own. A lot of the things they do are hard to understand—they like to climb up tall furniture, fit themselves in small spaces and attack small objects for no reason at all.

Now scientists have managed to figure out what exactly is going on in the brains of our little friends. According to Tony Buffington, a professor at Ohio State University in the US, cats’ strange behavior largely comes from their way of life back in the wild. “Cats today still have many of the same instincts that allowed them to live in the wild for millions of years.” he said in a TED Talk. “To them, our homes are their jungles.”

In the wild, cats are hunters. Their bodies and great balancing abilities allow them to climb to high spots to better look at the environment. Even though they don’t have to hunt any more in human houses, they still keep the old habit of viewing the living room from, for example, the top of the refrigerator.

Cats’ hunting instinct is also what makes them attack small things like keys and USB drives. In the wild, they hunt whatever they can get, and most of the animals they kill are small.

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Knowing how cats’ minds work is not only useful for better understanding them. It may also help cats’ owners to better meet cats’ needs. For example, owners could try to make climbing easier for cats by moving their furniture around. They could also use “food puzzles” to make eating feel more like hunting instead of just giving food to the cats.

1. According to Tony Buffington, ________.
A.cats’ strange behavior is difficult for humans to understand
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【推荐2】You needn’t book an expensive holiday to the lands of Africa to see animals. The UK offers a surprising number of wildlife experiences perfect for a family day out.

ZSL Whipsnade Zoo, Bedfordshire

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