Can you imagine a vegetable that can be made into【D1】________for a pie or can be a poison? That’ s exactly the case with a veget

Can you imagine a vegetable that can be made into a delicious filling for a pie or can be a poison? That’ s exactly the case with a vegetable called rhubarb. This sounds amazing, but it’ s true.
    Rhubarb is often mistaken for a fruit because it is usually baked in a pie and eaten as a dessert. In fact, another name for rhubarb is pieplant. When rhubarb is combined with strawberries, raspberries, and apples, the flavor only gets better. Rhubarb is sold in supermarkets in several ways. It comes in fresh stalks, frozen packages, or cans.
    The rhubarb plant has large, green leaves on long, thick stalks. Some leaves are as large as two feet across. The stalks may be about an inch wide and can grow up to two feet long. The part of the rhubarb plant that people can eat is the red, juicy stalk. Eating the leaves may make someone ill—they contain oxalic acid, which is a poison.
    The leaves of a rhubarb plant appear early in the spring. In cold climates, rhubarb is often the first sign of spring. Sometime later the plant produces large flowers and seeds. Unlike most vegetables, the seeds from a rhubarb plant are not usually used to grow new plants because the seed does not always grow into exactly the same kind of plant it came from. To grow a new rhubarb plant, farmers cut pieces of the root and buds. Then they plant that part in the ground. That way, the farmer knows that the new rhubarb plant will be similar to the plant from which it was cut. A rhubarb plant can live for five to eight years.