题目内容：

Do you know how to plant a tree? Once you’ve chosen a tree, you’ll need to prepare your place for planting.

Planting the Tree

Dig a hole a foot deeper than and twice as wide as the root ball of the new tree. Loosen the soil at the bottom and sides of the hole, so roots will be able to easily enter the soil.

Gently remove the tree from the container and guide the tree into the hole. Build soil up and around the roots if necessary, so the tree is at the same soil level as it was originally grown.

Straighten the tree in the hole. Before you begin filling, have someone view the tree from several directions to confirm that the tree is straight. You should fill the hole with existing soil that has been mixed with rich materials. At this time you can also add bone meal and then water the tree.

Caring for the Tree

Caring for the tree once it is planted, is an important step so you should provide regular watering. Always feel the soil before watering, as over-wearing can also harm the tree. When soil is dry below the surface of the covering, it’s time to water. You will probably need to water at least once a week. Continue until mid-fall, when lower temperatures call for less-frequent watering.

When to Plant a Tree

Now that you know how to plant a tree, the next step is deciding when to plant. Spring and fall are generally the best times to plant a tree. This gives the tree time to adjusts(调整)before summer heat or winter cold arrives. In areas without cold winters, trees may be planted during the winter.

1.How wide a hole should you dig if the root ball of your tree is 20cm wide?

A. 10cm    B. 20cm

C. 30cm    D. 40cm

2.Which of the following is one of the suggestions for planting a tree?

A. Making the tree straight in the hole

B. Watering the tree as much as possible

C. Filling the hole with soil without anything

D. Planting the tree in winter is best for its growth

3.What can we learn from “Caring for the Tree”?

A. It is necessary to keep the soil in the hole from getting dry

B. It isn’t very important to care for it after the tree is planted

C. It is very important to make sure that the soil in the hole is dry

D. It is necessary to water the tree frequently in lower temperatures

4.Why are spring and fall the best times to plant trees?

A. Both seasons don’t have much rain

B. It is easy to dig holes in both seasons

C. Trees can grow faster and well in both seasons

D. Trees have time to prepare to pass the following hard times