1 . Sunflowers are huge plants with bright yellow flowers. They have a long history in North America. There is evidence that they were used for food and for medicine by Native Americans beginning around 1000 B. C. The seeds from sunflowers were likely brought to Europe by Spanish explorers around the late 16th century. Over time, they found their way to Eastern Europe. Today, Ukraine is the world’s leading producer of the plants. Sunflowers are grown for their seeds and to make oil.

If you start growing sunflowers from seeds, put them in room-temperature water for 2-8 hours before planting to start the growing process. Plant each seed into dirt 2.5 centimetres deep and 15 to 30 centimetres apart. Plant them after the danger of frost has passed or start indoors three weeks before your last frost date. Keep the soil wet, but not too wet, until the seeds begin to grow.

Sunflower plants can be moved outdoors when the danger of frost has passed in your area. Choose a place outside that will provide the plants with at least 6- 8 hours of direct sunlight each day.

As the plants grow, they will develop long roots that work their way deep into the ground. So, before planting, it is important to loosen the soil. Dig at least one third of a metre down and remove any rocks.

Mixa large amount of compost (堆肥) into the soil where the plant will grow. Compost provides important, lasting nutrients that will help the plants all season long. The sunflowers may not need additional nutrients if they are planted with compost. If compost is not added during the planting process, provide nutrients through a slow release, all-purpose fertilizer (肥料) one or two times during the growing season.

1. What can be known about the sunflower in Paragraph 1?

A．It originated in South America.	B．It was initially used to make oil.
C．It has a history of 3,000 years or so.	D．It was taken to Europe by British explorers.

2. What are sunflower growers advised to do?

A．Keep the seeds in water for 10 hours.

B．Plant seeds 2.5 centimetres apart.

C．Never put new plants in direct sunlight each day.

D．Plant seeds indoors 21 days before your last frost date.

3. Why is it important to loosen the soil before planting?

A．It is friendly to roots’ growth.	B．It helps to hold water in the soil.
C．It guarantees adequate supplies of air.	D．It is more efficient in keeping temperature.

4. What are Paragraphs 2-5 mainly about?

A．How to select sunflowers.	B．How to grow sunflowers.
C．When to fertilize sunflowers.	D．When to move sunflowers.