Sunflowers can be slow starters and the tiny new plants don't seem to grow very rapidly. Gardeners should protect the new plants as they begin to grow. Once they get going, sunflowers are able to out-grow many weeds, making them easier to grow in the home vegetable garden than many other plants.

　　Most pests and diseases are not a bother to the sunflower, however, more than one gardener has said that their lovely looking plants were destroyed overnight by hungry squirrels, mice or birds. To preserve their harvest, gardeners can cover the ripening seed head with stockings or net cloth to help keep the destroyers off the seeds.

　　Planting sunflower seeds is easy and can help even the smallest gardener feel successful in their gardening attempts.

　　38. What is the passage mainly about?

　　A. How to plant sunflowers.

　　B. Different kinds of sunflowers.

　　C. Ways to preserve sunflowers.

　　D. Tips on making your garden bright.

　　39. Why should enough space be left between sunflowers?

　　A. To prevent birds from eating sunflower seeds.

　　B. To offer the sunflowers enough sunlight.

　　C. To protect the ripe seed heads before harvest.

　　D. To help the sunflowers grow stronger.

　　40. Why do children love to grow sunflowers in their garden?

　　A. They want to decorate their garden with sunflowers.

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