填入下面一段文字横线处的语句，最恰当的一句是（    ）

顾炎武思想的核心观点是“经世致用”，他对文人的清谈、玄学深恶痛绝，对王阳明的“心学”也嗤之以鼻，认为这是误人、误世的学问。____________，《天下郡国利病书》《日知录》《军制论》《田功论》《钱法论》等，研究的都是“当世之务”，凡赋税田亩、钱币权量、河槽水运、盐铁地理等，无不是最切实际、最接地气的论说。

不断加强皇权专制是中国古代统治者的不懈追求。阅读下列材料，回答问题。

材料一：三省中，中书省替皇帝起草政令，门下省负责审核，最后交由尚书省执行。尚书省下设有六部，分管具体政务。如房玄龄曾为尚书左仆射。

材料二：

     

图一                         图二

阅读理解
    Spring is an inviting season for outdoor activities. But be careful—the warm weather is also a hotbed for viruses(病毒) and disease.  
This March, the influenza(流行性感冒) A(H7N9) virus hit Shanghai, Anhui, Jiangsu and Zhejiang. It was reported that by April 11 at least 35 people had been infected (被感染的) with the H7N9 virus, and nine of them had died.
    The influenza A (H7N9) virus is one type of influenza A H7 viruses. Influenza A H7 viruses normally spread among birds.
This is the first time human infections with H7N9 viruses have been reported in China. Earlier reports were about H5N1 and H1N1.
All the three viruses are influenza A viruses but they are not the same. H7N9 and H5N1 are animal influenza viruses that could infect people. However, H1N1 viruses can be divided into two groups. One group can normally infect people and the other normally infects animals. Also, H1N1 can spread from human to human, but H7N9 probably can't, according to the World Health Organization (WHO).
Most people infected with H7N9 looked like they had the common flu. Some people had bad pneumonia(肺炎). They suffered from a fever, a cough and shortness of breath.
    But don't be afraid – it is not easy to be infected with the virus. One of the possible reasons is close contact with sick poultry (家禽) waste. People may also be infected through breath, according to National Health and Family Planning Commission.
Here are some tips from the WHO that can protect you from being infected.
    Wash your hands with soap and running water before you eat, after you use the toilet, and after touching animals or animal waste.
When coughing or sneezing cover your mouth and nose with a mask(口罩)，tissue(纸巾) or a sleeve.
    Get a good rest and do exercises, which will help make your body strong enough to stand up to the virus.

“$m=1$”是“直线$x+m^{2}y=0$与直线$x-y=1$垂直”的（　　）

我们吃花生时，剥去的最外的硬壳、捻去的红颜色皮、暴露出来的两个白颜色瓣分别是由（ ）发育而来的。