Some gardeners say potted roses are easier to plant. They say the roots develop better. But Jeffrey Dinslage, an expert, points out that bare-root roses come without soil. So they weigh less to transport.

　　Another expert advises getting bare-root roses as close to planting time as you can. If they arrive before you are ready to plant them, make sure the packing material is moist. Keep the plants in a cool, dark place. The resting plants have no leaves but still need water. When growing roses, the soil should feel moist deep down. Watering should be done in the morning.

　　But do not water too much. People often ask Jeffrey Dinslage about unhealthy discoloration on rose leaves. He says the spots are usually caused by too much water. After heavy rains or too much watering, he advises pulling away mulch, the substance used to protect the roots, to improve the quality of the soil, temporarily from around the roots. This will help dry the soil.

　　68. From the first paragraph, we know that in the United States_____ .

　　A. all the people like roses

　　B. there are a lot of national flowers

　　C. some roses don’t smell sweet

　　D. there are some other popular flowers

　　69. How many kinds of roses can you buy according to the passage?

　　A. One.

　　B. Two.

　　C. Three.

　　D. Six.

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