The banana "tree" is actually not a real tree. This is because there is no wood in the stem(树干)rising above the ground. The stem

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问题     The banana "tree" is actually not a real tree. This is because there is no wood in the stem(树干)rising above the ground. The stem is made up of leaves growing very close together, one inside the other. The leaves spread out at the top of the stem and rise in the air.
    Banana plants need a lot of care and attention. They must be provided with water if the normal rainfall doesn’t supply enough. The area around the plants must be kept free of weeds(杂草)and grass.
    About nine or ten months after planting, a flower appears on the banana plant. This flower is at the end of a long stalk(茎), which grows from the base up through the center of the stem and turns downward when it comes out from the top. Small bananas form on this flower stalk as it grows downward. Bananas really grow upside down. As the small bananas form on the stalk, they point downward, but as they grow they turn and point upward.
    Bananas are harvested while they are still green. Even when they are to be eaten where they are grown, they are not allowed to ripen on the plant. A banana that turns yellow on the plant loses its taste.
The underlined word "it" in the third paragraph refers to______.

选项 A、the leaf
B、the stalk
C、the stem
D、the plant

答案B

解析 从文章第三段第二句话“This floweris at the end of a long stalk,which grows from…when it comes out from the top.”可知,这朵花会开在长长的茎的末尾处,这个茎从底部开始向上生长,从树干中间穿过,到顶部后开始往下垂。这句话中it代表的是茎(the stalk)。
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