问题
选择题
环境中生物与生物间的关系是复杂的，相互间的影响也是多样的。下列各组生物中，构成寄生关系的是 [ ]
A．水稻和杂草
B．蛔虫和人
C．蜜蜂和油菜
D．狼和鹿
答案
答案：B
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环境中生物与生物间的关系是复杂的，相互间的影响也是多样的。下列各组生物中，构成寄生关系的是 [ ]
A．水稻和杂草
B．蛔虫和人
C．蜜蜂和油菜
D．狼和鹿
答案：B
When I first entered university, my aunt, who is an English professor, gave me a new English dictionary. I was 1 to see that it was an English English dictionary, also known as a monolingual（单语的） dictionary. 2 it was a dictionary intended for non-native learners, none of my classmates had one and, to be honest, I found it extremely 3 to use at first. I would look up words in the dictionary and still not fully understand the meaning. I was used to the 4 bilingual（双语的）dictionaries, in which the words are 5 both in English and Chinese. I really wondered why my aunt 6 to make things so difficult for me. Now, after studying English at university for three years, I 7 that monolingual dictionaries are 8 in learning a foreign language. As I found out, there is in fact often no perfect equivalence(对应) between two 9 in two language. My aunt even goes so far as to 10 that a Chinese “equivalent” can never give you the 11 meaning of a word in English! Therefore, she insisted that I read the definition(定义) of a word in a monolingual dictionary when I wanted to get a better understanding of its meaning. 12 , I have come to see what she meant. Using a monolingual dictionary for learners has helped me in another important way. This dictionary uses a(n) 13 number of words, around 2, 000, in its definitions. When I read these definitions, I am 14 exposed to the basic words and learn how they are used to explain objects and ideas. 15 this, I can express myself more easily in English.
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