Language teachers, learners and other professionals across the USA are celebrating National Grammar Day on March 4. The holiday, created by Martha Brockenbrough in 2008, celebrates the rules and best practices for the English language. Brockenbrough is the founder of the Society for the Promotion of Good Grammar, or SPOGG, which operates a website where Brockenbrough writes about different language issues.
Mignon Fogarty, who is organizing National Grammar Day celebrations this year, wrote the book "Grammar Girl's Quick and Dirty Tips for Better Writing." Fogarty appeared on the NBC television program "Today" on Wednesday. She discussed new additions to the English language. "People think that dictionaries choose new words because they are proper, she said." But mostly they choose words because people use them."
The American Dialect Society chooses a word every year that is new or used in a new way .The choice for 2015 Word of the Year was "they," used to refer to "he" or "she". The Oxford English Dictionary adds new words after finding evidence people are using the words often. Researchers for the dictionary also look for evidence the words will be used well into the future.
Grammarly is a software application, or app, which can study writing and find grammar mistakes. In preparation for National Grammar Day, Grammarly studied the writing on the Twitter accounts of the 50 people with the most followers in the world and counted the average number of mistakes in their writing. Then the top 10 accounts with the fewest mistakes were listed.
Comedian Conan O'Brien had the best grammar. He averaged 0.21 mistakes for every 100 words he wrote. Businessman Bill Gates had the second best grammar, with an average of 0.22 mistakes. President Barack Obama came third with an average of 0.26 mistakes.
The National Grammar Day website has many resources for language learners. You can celebrate the day by reading our weekly series "Everyday Grammar."

(1)探究培养液中酵母菌种群数量的动态变化.
①在实验中,如果血球计数板的一个小方格内酵母菌过多,难以数清,应当采取的措施是 .对于压在小方格界线上的酵母菌,正确的计数方法是 . 每次吸取样液进行计数前,要轻轻震荡试管,原因是 .
②下表是某小组记录的实验结果:
时间 | 第1天 | 第2天 | 第3天 | 第4天 | 第5天 | 第6天 | 第7天 |
酵母菌数(万个/毫升) | 32 | 127 | 762 | 824 | 819 | 821 | 820 |
从表中的数据可以得出结论:酵母菌的种群数量呈 型增长.如果持续观察,最终酵母菌的数量将发生什么变化? .根据所学的知识,推测影响酵母菌种群数量增长的环境因素有 (举二例).
(2)该小组在上述实验的基础上,继续探究某环境因素对酵母菌细胞呼吸方式的影响,得如下实验结果.
氧浓度(%) | a | b | C | d |
产生CO2的量(mol) | 9 | 12.5 | 15 | 30 |
产生酒精的量(mol) | 9 | 6.5 | 6 | O |
据表可知:实验的自变量是 ,氧气浓度为c时,酵母菌进行 呼吸.
材料一:“文明需法治。”法治,是这个时代的共识。法治不仅是一种社会信仰,也是一种生活刚需。每个人的法治意识与法治素养,构成了美好生活的一部分。为加强法治教育宣传,某班开展“法律在我心中”的主题班会,乐乐的发富赢得同学的一片喝彩。
材料二:学校综合实践平台开展以“传承戏曲文化,保护民族魏宝”为主题的社会调查活动,乐乐参与调查活动方案设计,并拟写了此次调查活动的目的。