题干

下列有关说法不正确的是(   )

A:常温下浓硫酸能使铝发生钝化,可在常温下用铝制贮罐贮运浓硫酸

B:铁在纯氧中燃烧或高温下和水蒸气反应均能得到Fe3O4

C:金属铝排在金属活动性顺序表中氢元素的前面,铝与强酸反应一定放出氢气

D:将铁粉加入FeCl3、CuCl2混合溶液中,充分反应后剩余的固体中不一定有铁

上一题 下一题 0.0难度 选择题 更新时间:2019-05-06 09:32:53

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C

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    Living among trees, plants and flowers can fill your life with beauty. And if you are a woman, it can also help you live longer. Researchers found that women who live in homes surrounded by plants appear to have lower death rates than women who live in areas with fewer plants.

    Researchers at Harvard University's T.H. Chan School of Public Health reported the finding. They looked at the information from one of the largest and oldest investigations of the women's health: the Nurse's Health Study. It began 40 years ago. It now has information on nearly 200,000 women.

    For the new study, the team looked at the death rates of more than 100,000 women between the years 2000 and 2008. Then the researchers compared the death rates of these women to the plants around their homes. The researchers also considered other things, such as the age of the women, money they earn and race. They also looked at whether or not the women smoked.

    The study found that the death rate among women who lived in the greenest spaces was 12% lower than those from the least green areas. The researchers were surprised to find such a strong connection between high vegetation levels and low death rates.

    The study suggested that living among trees, flowers and other plants lowered levels of depression. Researchers said women in greener areas spent more time with other people and exercised more. It is common knowledge that plants can help the environment in many ways. The new finding also suggested ways to the government and the city planners to grow even healthier living areas.