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【答案】C
【解析】略
13.(2025·云南省·月考试卷)—______ do you go to the Science Club
—Twice a week.
A. How often B. How soon C. How much
【答案】A
【解析】句意：——你多久去一次科学俱乐部？——一周两次。How often多久一次；How soon多久以后；How much多少。根据“Twice a week”可知此处是询问频率，应用how often进行提问。故选A。


C. Cautiously positive. D. Overly supportive.
D
As dark sky shelters grow in popularity, scientists are revealing more of the benefits of darkness—from enhancing cellular repair to improving your mental health.
“Brightening our days and darkening our nights is critical to our health,” says Lynne Peoples. Finding a timely balance between light and dark helps us stay healthy. Researchers are starting to explore the health benefits of spending time in natural darkness. We now know that staying in the dark can contribute to better health.
And that’s not all that darkness can do for you. A 2020 study showed that spending time in the dark can reduce anxiety and depression. It has long been clear that spending time in nature is good for your mental health—and a 2024 study published in the Journal of Environmental Psychology suggests that the benefits hold true at night as well as during the day.
The psychological benefits of spending time in the dark can be found. Both mindfulness and creativity can be encouraged by darker spaces. There is a deeper reason why the lights go down before the curtains rise in theater productions and cinemas: darkness creates a space where imaginations can flow more freely.
For those who live in places with too much darkness: try sun lamps, which can be switched on and off to help reset body clocks. One of the biggest barriers to accepting the dark may be the negative values we attach to it, including the belief that darkness is linked to disorder and crime (leading to more street lights in so many parts of the world) as well as to our deep-rooted fear of all things that make strange noises in the night.


2、[青桐鸣]2025届河南省高三5月联考数学试题


6、[青桐鸣]2025届河南省高三5月联考数学试题


2、[青桐鸣]2025届河南省高三5月联考数学试题


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2、[青桐鸣]2025届河南省高三5月联考数学试题


2、[青桐鸣]2025届河南省高三5月联考数学试题


(2)对有多种反应物的体系，增大便宜、易得的反应物的浓度，可以提高其他物质的利用率，使反应充分进行。如工业制硫酸过程中，通入过量的O2以提高SO2的转化率。
(3)增大物质浓度可以加快反应速率，使平衡发生移动，应结合具体问题进行具体分析。
4．加入物质的目的
(1)加碱：去油污，去铝片氧化膜，溶解铝、二氧化硅等。
(2)加沸石或碎瓷片：防止液体暴沸。
(3)加有机溶剂：萃取某些物质，或降低某些物质的溶解度。
(4)加氧化剂：与原体系中还原剂发生氧化还原反应。


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