保护动物多样性最主要的措施是

能正确表示下列化学反应的离子方程式的是 （    ）

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    In much of Asia, especially the so-called “rice bowl” cultures of China, Japan, Korea, ____Vietnam, food is usually eaten with chopsticks.

    Chopsticks are usually two long, thin pieces of wood or bamboo. They can also be made of plastic, animal bone or metal. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might ____ (make) of gold and silver with Chinese characters. Skilled workers also combine various hardwoods and metal ____ (create) special designs.

    The Chinese have used chopsticks for five thousand years. People probably cooked their food in large pots, ____ (use) twigs（树枝）to remove it. Over time, ____ the population grew, people began cutting food into small pieces so it would cook more quickly. Food in small pieces could be eaten easily with twigs which ____(gradual) turned into chopsticks.

    Some people think that the great Chinese scholar Confucius, ____ lived from roughly 551 to 479 B.C., influenced the ____ (develop) of chopsticks. Confucius believed knives would remind people of killings and ____ (be) too violent for use at the table.

    Chopsticks are not used everywhere in Asia. In India, for example, most people traditionally eat ____ their hands.

（Ⅰ）地产数据研究院研究发现，3月至7月的各月均价y（万元/平方米）与月份x之间具有较强的线性相关关系，试建立y关于x的回归方程（系数精确到0.01），政府若不调控，依次相关关系预测第12月份该市新建住宅销售均价；

（Ⅱ）地产数据研究院在2016年的12个月份中，随机抽取三个月份的数据作样本分析，若关注所抽三个月份的所属季度，记不同季度的个数为X，求X的分布列和数学期望．

参考数据： ${\displaystyle \sum }_{i=1}^5{x}_i$ =25， ${\displaystyle \sum }_{i=1}^5{y}_i$ =5.36， ${\displaystyle \sum }_{i=1}^5\left(x_i-\overline{x}\right)\left(y_i-\overline{y}\right)$ =0.64

回归方程 $\widehat{y}$ = $\widehat{b}$ x+ $\widehat{a}$ 中斜率和截距的最小二乘估计公式分别为：

$\widehat{b}$ = $\frac{{{\displaystyle \sum }}_{i=1}^n\left(x_i-\overline{x}\right)\left(y_i-\overline{y}\right)}{{{\displaystyle \sum }}_{i=1}^n{(x_i-\overline{x})}^2}$ ， $\widehat{a}$ = $\overline{y}$ ﹣ $\widehat{b}\overline{x}$ ．