【名词&注释】
对角线(diagonal)
[单选题]若菱形两条对角线的长分别为6和8,则这个菱形的周长为
A. 20
B. 16
C. 12
D. 10
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学习资料:
[单选题]( )The purpose of the three ads is to __________.
A. sell these books to the children
B. help children learn English
C. help children learn about nature
D. use a dictionary to pronounce correctly
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