题目内容：

    Humans and elephants don’t always get along. In Africa and Asia, elephants damage equipment, farmers’ crops, and natural habitat for other species. If an elephant becomes a problem, humans may kill it. So local people and animal protectionists are trying to find better ways to keep elephants away from sensitive places. Now, researchers think they have a good tool to prevent elephants: honeybee pheromones (信息素).

“Elephants dislike being stung(叮咬) in the trunk, because it’s an extremely sensitive organ. Imagine being stung in your nose by a bee, and multiply that a few thousand times.” said Mark Wright, a professor at the University of Hawaii.

Kenyan farmers have long known that if they hang live beehives (蜂箱) around their farms, they will drive elephants away. The problem is how to manage hundreds of thousands of hives, if you have a huge area to protect. And then the idea came up to look at the alarm pheromones, which are chemicals that the bees release to launch an attack on something that’s damaging the hive.

So the researchers tested out an artificial mixture of chemicals that imitates (模仿) honey bees’ alarm pheromones. The researchers hung white socks treated with the artificial mixture as well as untreated control socks around an elephant watering hole, and then observed the animals’ behavior. “Elephants are really curious creatures. They’ll walk along and see something like a sock hanging on a branch. If it’s not treated with the alarm pheromones, they’ll pick it up, throw it around, and try to taste it, things like that. And in the case of the treated ones, they would show immediate signs of unease or uncertainty, and they’d eventually back off from them.”

In order to avoid the elephants more effectively, the researchers plan to make the pheromone mixture purer. That way, elephants will stay far away from wherever they should not be going-and both elephants and humans can coexist a bit more peacefully.

1.What can we infer from the underlined sentence in paragraph 2?

A.Bees enjoy stinging elephants.

B.Elephants’ trunk is a sensitive organ.

C.Being stung in the trunk is unbearable to elephants.

D.Honeybee pheromones make elephants suffer great pain.

2.Why didn’t the researchers hang live beehives to keep elephants away from crops?

A.Because it’s not practical.

B.Because it doesn’t work to elephants.

C.Because elephants like the taste of honey.

D.Because researchers prefer to invent new chemicals.

3.Paragraph 4 mainly tells us_________.

A.how the experiment was carried out

B.elephants’ reaction to the white socks

C.how to imitate honeybee alarm pheromones

D.why the team hung two different white socks

4.What’s the purpose of the research?

A.To cut down the number of elephants.

B.To keep elephants away with bees’ stings.

C.To prevent elephants from damaging crops.

D.To better the relation between humans and elephants.