S1=1
S2=2+3=5
S3=4+5+6=15
S4=7+8+9+10=34
S5=11+12+13+14+15=65
S6=16+17+18+19+20+21=111
S7=22+23+24+25+26+27+28=175
…
可得S1+S3+S5+…+S2n﹣1=____.
读坎儿井图,完成下题。
坎儿井的水源主要来自( )
- Look at me. I'm a cow.
- I'm big. I like grass.
What's the weather like in spring?