Virginia Beekeeper Billy Davis has been keeping bees since the 1960s. He has followed the sharp drop in the number of honeybees across the country. Two years ago, he set up a non-profit group called the Sustainable Honeybee Program. It develops stronger bees and is teaching beekeepers how to strengthen their bee colonies.Experts say more than one-third of the honeybees are disappearing. Their disappearance could have resulted from things like climate change, parasites and chemicals used in agriculture. The Sustainable Honeybee Program operates a farm with more than 50 bee colonies. Alex McLellan is the group’s chief operations officer. He said, “Americans are trying different ways to fight the loss of bees. They include using less chemicals and pesticides. More people are planting bushes and flowers that bees prefer. The ultimate goal here is to generate bees that are able to take care of themselves better. And we proved by not using chemicals here for the last seven or eight years, that it is possible to keep bees and to have them survive without the use of chemical intervention. And that’s important.”One tactic to help bee populations stay healthy is “hygienic behavior”, or the ability to identify and remove diseased bees from the colony. Alex McLellan says the group has breeding programs for producing queen bees and sharing them with local beekeepers. He says these ‘hygienic honeybees’ will be able to recognize threats to the colony, and take corrective action. Prior to this year, survivability reached over 90 percent, which is far higher than the average nationally.1.What do we know about the Sustainable Honeybee Program?A) It was founded in the 1960s.B) It aims to make profits for beekeepers.C) It advocates the environmental protection.D) It teaches beekeepers useful skills.2.Which of the following is one of the reasons for bees’ disappearance?A) Lack of bushes and flowers.B) Unqualified beekeepers.C) Chemicals used in agriculture.D) Diverse diseases.3.What did Americans do to battle with bee disappearance according to the passage?A) Train more professional beekeepers.B) Increase reproduction of bee colonies.C) Use less chemicals and pesticides.D) Develop better treatment of diseased bees.4.What tactic do beekeepers use to keep bee populations staying healthy?A) Developing bees’ ability to identify diseases and warn beekeepers.B) Producing hygienic honeybees that can recognize threats to the colony.C) Teaching bees healthy living habits to keep them stay healthy.D) Training bees to discover and remove dead bees out of the colony.