Avocadosarelarge,heavy,darkgreenfruitsthatareusually...

问题详情：

    Avocados are large, heavy, dark green fruits that are usually shaped like pears. The riper they get, the softer they get. People eat avocados in salads and sandwiches. But probably the most popular way to use avocados is in guacamole, a delicious Mexican snack(小吃). Inside the fruit is a very large seed(种子), which you can use to grow a tall, beautiful avocado plant.    1）Wash the avocado seed with cold water. Stick four tooth-picks around the middle of the seed.     2）Fill the jar almost to the top with water that is just slightly warm. Rest the toothpicks on the top of the jar. The more pointed end of the seed should be in the water while the flatter end should face upward.     3）After that, you will have to wait for three or four weeks. During that time, be sure to add just enough water to replace the water that evaporates into the air. The bottom of the seed should always be just below the water’s surface. The thin brown skin that covers the seed will crack(破裂) open. Roots will start growing out of the bottom of the seed. Leaves will start growing at the top.     4）When the roots are about three inches long, fill a flowerpot with soil and plant the seed. Make sure that the seed is completely covered by soil and that the young leaves are above the soil.      5）Find a sunny spot for the plant. Water it every few days to keep the soil moist (潮湿的). Watch it during the next few months. Your avocado plant will grow a tall, straight stem (茎) and large oval leaves. 8. The main idea of the first paragraph is to ______.    A. tell us how to grow an avocado plant                  B. give us a brief introduction to avocados    C. tell us the shape and color of avocados               D. tell us that avocado is a fruit 9. Which of the following statements is NOT true according to the passage?     A. The two points of the seed are of the same shape.     B. The soil in the flowerpot should neither too dry nor too wet.     C. We’d better use ripe avocados to make some guacamole.     D. The most popular way to use avocados is in guacamole. 10. The word “evaporates” in the fourth paragraph means _______.     A. turns into ice because of cold weather                       B. becomes very hot by the sun heat            C. turns into other things because of chemical change      D. becomes vapor and disappear 11. How long will the thin brown skin that covers the seed crack open?     A. 1 or 2 weeks.            B. 2 or 3 weeks.            C. 3 or 4 weeks.            D. a few days.

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