先化简再求值：$\left(\frac{a^2-5a+2}{a+2}+1\right)÷\frac{a^2-4}{a^2+4a+4}$，其中$a=2+\sqrt{3}$．

    Emma is very busy in the moming. She gets up at half past five. After brushing her teeth, she ____. She usually does sports for thirty minutes. Next, she helps to make breakfast. At half past six, she eats breakfast. For breakfast Emma usually has bread and milk. She____ eats hamburgers. Hamburgers are unhealthy. Emma needs a healthy ____. After breakfast she____ her room. Then she goes to school. Emma usually____to school. She says walking is good for her.

十二届全国人大代表共有2985名代表，其中工人农民551人，知识分子631名，干部968名，民主党派和无党派人士480名，人民解放军268名，香港特别行政区36名，澳门特别行政区12名，归国华侨38名，其中少数民族代表415名。这体现了我国民主主体的（    ）

下列生物中属于单细胞生物的是（　　）

森林能增加大气湿度，增加降雨量，这说明（  ）