spring.It is best not to plant in the heat of summer or the cold of winter.

　　One of the most common mistakes in butterfly gardening is planting only one nectar source.Adult butterflies have a very short lifespan.Planting a variety of nectar sources will encourage more butterflies to visit the garden.Planting an adequate supply of host plants gives butterflies a place to lay their eggs，which will successfully hatch (孵化) and result in butterflies that will continue to visit the garden.

　　Butterflies typically lay their eggs in late spring and hatch 3－6 days after they are laid.It takes 3－4 weeks for a caterpillar to pupate (化蛹) and 9－14 days to emerge as an adult.

　　Good resources for learning more about butterfly gardening include zoos，botanical gardens，butterfly houses，garden centers and nurseries，libraries and the Internet.There are many good websites dedicated to butterflies and butterfly gardening.

　　5．Which of the following is true，according to the passage?

　　A．Butterfly gardens can be grown only in some parts of the US.

　　B．Butterfly gardens must be large in size. C．Butterfly gardens should be in a sunny place.

　　D．Butterfly gardens need to plant butterfly­attracting plants only.

　　6．Native butterfly­attracting plants are better because________.

　　A．they smell better to butterflies

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