The ants and the grasshopper(蝗虫）lived in the same big field. The ants always worked hard, and tried to prepare and harvest enough food for winter. Their happy neighbor, the grasshopper, couldn‘t understand them. He just kept singing. One winter day, the ants were busy spreading their grain in the sun to dry. The grasshopper were nearly dying of hunger, so he went to the ants to ask for some food. “Good day to you, kind neighbor,” said the grasshopper. “Won‘t you lend me a little food? I will certainly repay you before this time next year.“Why don‘t you have any food of your own?” asked an old ant.” There was a lot of food in the big field all summer. What did you do?“ Oh,”said the grasshopper, forgetting his hunger,” I sang all day long and all night long”.“Well, then,”said the ant.”If you can sing all summer, you should dance all winter.” And the old ant went back to her work, singing the ant song,” We ants never borrow; we ants never lend.” The ants and the grasshopper lived in different fields. While the grasshopper was singing, the ants were preparing food for winter. One winter day, the grasshopper invited the ants to sing with them. The grasshopper sang day and night all summer. The ants agreed to lend the grasshopper some food in the end.

判断题

the big field all summer. What did you do?“ Oh,”said the grasshopper, forgetting his hunger,” I sang all day long and all night long”.“Well, then,”said the ant.”If you can sing all summer, you should dance all winter.” And the old ant went back to her work, singing the ant song,” We ants never borrow; we ants never lend.”The ants and the grasshopper lived in different fields.While the grasshopper was singing, the ants were preparing food for winter. One winter day, the grasshopper invited the

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材料题

in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants in

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材料题

in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants in

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单选题

The unit pressurizes and filters the oil.

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材料题

in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants in

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