已知等差数列{a_n}中，a₃=9，a₅=17，记数列$\left\{\frac{1}{a_n}\right\}$的前n项和为S_n，若$S_{2n+1}-S_n\le \frac{m}{10}\left(m\in Z\right)$，对任意的n∈N^*成立，则整数m的最小值为（　　）

   A plant makes its own food in its leaves . Water comes to the leaves through the roots . Air gets into the leaves through very small holes . The green coloring in the leaves uses the water and air to make the food for the plant . It also needs sunshine because a plant can make food only when the sun is shining.
   Animals and people could not live without green plants . They both eat plants . People and some animals also eat the meat of some animals and these animals eat plant

找出画线部分发音不同的选项。

①____  A.bags     B．cats     C．dogs

②____  A．buses     B．boxes      C．cups

③____  A．usually    B．casual     C．speak

④____   A．books     B．hands      C．caps

⑤____  A．oranges    B．lakes      C．cakes