读一读，连线。

①What do you like doing? ____   A.It's white and yellow.

②Do you like this pear tree? ____ B. Yes, it does.

③What colour is this flower?____    C.Yes, I do.

④Does it have long leaves? ____    D. They need water.

⑤What do the plants need?____    E. I like listening to music.

（a+b）²=a²+2ab+b²

（a+b）³=a³+3a²b+3ab²+b³

（a+b）⁴=a⁴+4a³b+6a²b²+4ab³+b⁴

（a+b）⁵=a⁵+5a⁴b+10a³b²+10a²b³+5ab⁴+b⁵

…

请你猜想（a+b）¹⁰的展开式第三项的系数是（   ）