问题
选择题
下面哪组中的两个数只有公因数1？[ ]
A．63和81
B．24和18
C．34和51
D．13和36
答案
答案：D
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下面哪组中的两个数只有公因数1？[ ]
A．63和81
B．24和18
C．34和51
D．13和36
答案：D
Li Fei is my new pen pal. She is 21 Singapore. Singapore is a small but beautiful 22 in Southeast Asia(东南亚).It is 23 and has green plants everywhere, so people also call it “Garden City” in the world. Li Lei is a 24 girl. She is a student in No.6 Middle School in Singapore. She speaks English 25 .And she can also speak 26 Chinese. Her favorite 27 at school is history. She thinks it is very interesting. Li Lei likes 28 very much. She wants to have a dog as a pet, but she can’t, 29 her parents don’t like animals. She is very sad about this. Li Lei likes China very much. She hopes to 30 China very much.
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