Imagine a product that can be used as medicine, a cleaning agent and a beauty treatment. You can eat it, drink its juice, and【C1

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问题     Imagine a product that can be used as medicine, a cleaning agent and a beauty treatment. You can eat it, drink its juice, and【C1】______essential oil from it. It is available all over the world, and is inexpensive. You may even have one in your kitchen【C2】______What is it? The lemon!
    It is thought that lemon【C3】______in Southeast Asia. From【C4】______they were gradually carried westward toward the Mediterranean. Lemon trees thrive in mild【C5】______, which is why they grow so well in places like Italy, Mexico, Spain, and even parts of Africa and Asia. A mature tree, depending on the variety and location, can produce【C6】______from 200 to 1, 500 lemons a year. The cultivated(培育的)varieties【C7】______in different periods, making it possible to harvest lemons all year round.
    You don’t need lots of space to grow a lemon tree. Even a sunny balcony(阳台)is enough,【C8】______small lemon trees can be grown in pots and can make your house beautiful. They like sunny, wind-free spots where they can soak up the warmth,【C9】______against a wall. However, if the temperature drops a lot during the winter, they need to be【C10】______or brought indoors.
【C8】

选项 A、as
B、though
C、when
D、while

答案A

解析 一个小小的阳光充足的阳台足矣,因为小柠檬树能种植在花盆里,美化室内环境。本题考查逻辑关系。as“因为,当”,though“虽然”,表示转折的逻辑关系,when“当……的时候”,while“然而”,表示对比。根据句意,上下分句表示因果逻辑关系,因此本题答案为A。
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