阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。
Mushrooms are tasty and rich in healthy nutrients (营养物), which makes some people collect them in the wild. However, eating the wrong mushrooms can make you sick or even dead. Therefore, growing mushrooms yourself inside your own home is getting popular.
There are two ways to do this. You can buy a set of materials from a garden store called a "grow kit (工具包) "or you can put them together yourself.
Grow kits(GK)
Grow kits are a great way for beginners to try growing mushrooms. These grow kits include partly-grown mushroom starters, called "spawn." (菌种体) The spawn is set in soil (土壤) and is planted in its own grow box. You put the spawn in water overnight. Then you return it to the box and open it to fresh air. Water it twice a day.
Within two or three weeks, you will be eating mushrooms with more on the way. It is fun and easy.
Putting them together yourself(PTTY)
If you want a larger harvest, it will cost less to put the materials together yourself. It is easy, too.
For starters, you will need a wooden, metal, or plastic box and some soil mixed with compost (肥料) and other materials. You will also need to buy fungal spores (真菌孢子) (something like seeds).
With clean hands, fill the box with your soil and materials. Put the spores evenly over the soil substance (物质) and water it twice a day gently.
To grow quickly and effectively, the spore-topped soil material should be kept away from direct sunlight. It should be kept at or close to 21℃. Put a piece of cloth lightly over the top of the box to keep moisture(水分) in. But do not cover it tightly (紧紧地). After it was coated with mycelium (菌丝体), move the box to a cooler place —12℃ to 15 ℃.
Mushrooms grow very quickly. With their tops fully open, they will be ready to harvest. That will be in about three to four weeks. Use a sharp, clean knife to cut them at soil level to avoid influencing nearby growth.
Do you want to taste safe and nutritious mushrooms? Grow them at home right now.
