如图，在△A1B1C1中，已知A1B1=7，B1C1=4，A1C1=5，依次连接△A1B1C1三边中点，得△A2B2C2，再依次连接△A2B2C2的三边中点得△A3B3C3，…，则△A5B5C5的周长为 ．
Would you mind （借）me your eraser？I can't find mine．
Country is a traditional kind of music from the （南方）states of America．
The dish my mom is cooking s nice，I can't wait to eat it．
Christmas is in December，the t month of the year．
I'm hoping to take a （a time of rest from work or school） in Europe at the end of this month．
粤公网安备 44130202000953号