题目

NaHSO3溶液在不同温度下均可被过量KIO3氧化，当NaHSO3完全消耗即有I2析出，依据I2析出所需时间可以求得NaHSO3的反应速率。将浓度均为0.020 mol·L－1的NaHSO3溶液(含少量淀粉)10.0 mL、KIO3(过量)酸性溶液40.0 mL混合，记录10～55 ℃间溶液变蓝时间，55 ℃时未观察到溶液变蓝，实验结果如图所示。据图分析，下列判断不正确的是( ) A．40 ℃之前与40 ℃之后溶液变蓝的时间随温度的变化趋势相反 B．图中b、c两点对应的NaHSO3反应速率相等 C．图中a点对应的NaHSO3反应速Mary Jean Price Walls graduated second in her class in 1950.She had high hopes when she applied to a local college,Southwest Missouri State College.But after sending off her application，she spent months waiting for a reply.It never came. Worse than simply being denied admission(拒绝接收)，the school didn’t reply to her at all.It wasn’t a matter of her school records，but of her skin color：Wallsis African American，and in those days，that fact alone closed a lot of doors. “I was sad and I was hurt,”Walls told ABC News.“I did not expect the skin color would affect my application.I thought I could go to university like other students.” Four years later，the government declared that all schools should not discriminate against(歧视)African Americans— but it was too late for Walls.She’d moved on with her life, becoming a wife and a mother，and working as an elevator operator.She retired last year，at the age of 77. She stayed quiet about the unfairness she’d faced in Missouri State.Her son，Terry，went through school records and found that she’d been the first black student to ever apply to the college.Today,four percent of the Southwest Missouri State College body is African American—including Terry. Although it’s too late for Missouri State to change the past，the school is awarding Walls with an honorary degree(荣誉学位)from the school.While she knows it’s too late for herto change the course of her own life with the degree，it’s a chance for her to show her family that Missouri State has changed in the last 60 years，and there’s not a single door closed to them anymore. 1.Walls couldn’t enter the local college because________. A．her examination performance is too bad B．girls were not allowed to go to college C．she was an African?American student D．her parents had no enough money to support her 2.Before she was denied Walls thought that________. A．her application would be accepted as others’ B．it was hard to become a college student C．it was impossible for her to be admitted D．she could be the best student in her college 3.What can we know about Walls’s son? A．He helped his mother get the honorary degree. B．He is a good student who teachers like best. C．He was admitted by the college once his mother applied to. D．He wants to be a government official who can help his mother. 4.What can we infer from the passage? A．Walls did not fight for her right to education. B．The college did not receive Walls’s application. C．Walls got a good job after she received the degree. D．The government gave Walls some money for the wrongs. 5.Walls’s honorary degree suggests that________. A．she could change her life with the degree B．her dream of going to college has come true C．she has been leading a happy life with her family D．great changes have taken place in Missouri State