It's________ in spring.
A：warm
B：hot
如图，小方格的面积是1，图中以格点为端点且长度为5的线段有 ( )
—They keep their hands on the phones wherever they go, even while they _______ meals.
①取代 ②加成 ③消去 ④酯化 ⑤水解 ⑥氧化 ⑦中和．
