A、They have no roots. B、They don’t need sunshine. C、They don’t need water. D、They have no leaves but need water. D短文中提到，应当种植处于休眠

(11)Some people say roses are difficult to grow. But you’ll have a good chance of success if you start with a few suggestions from experts. You should plant your roses where they can get sunshine for about six hours on bright days. You can buy roses from a garden center or by mail order. You can buy potted roses, also known as container roses, or bare-root plants. Some gardeners say potted roses are easier to plant. They say the roots develop better.(12)Other gardeners point out that bare-root roses come without soil. So they weigh less to transport. However, experts advise 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. Plant the roses while they are dormant(休眠的).(13)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. That can prevent problems called black spot and mildew(霉菌). But do not water too much, because too much water may cause spots on rose leaves.(14)After heavy rains or too much watering, experts advise pulling away the covering temporarily from around the roots, which will help dry the soil.
11. What does this passage mainly talk about?
12. What’s an advantage of bare-root roses according to some gardeners?
13. What’s the feature of resting plants according to this passage?
14. What’s the function of the covering on rose roots?