题目内容

实验组和对照组除了（）外，其他条件应该尽可能相同。

A. 处理因素
B. 年龄人口构成
C. 系统误差
D. 个体因素
E. 抽样误差

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实验设计的基本原则是

A. 对照
B. 均衡
C. 重复
D. 随机
E. 盲法

[音频]Single-sex education can have enormous (1) for female students. Numerous studies have shown that women who attend single-sex schools tend to have stronger (2), better study habits and more (3) career goals than women who attend coeducational schools. Girls who graduate from single sex schools are three times more likely to become engineers than those who attend coeducational schools. The reason is that all-girls schools encourage women to enter fields traditionally (4) by men, such as science, technology and engineering. In coeducational schools, girls are often expected to succeed only in (5) or the arts. Research has also shown that in coeducational settings, teachers are more likely to praise and give in-depth (6) to a boy's comments in class. In contrast，they might only respond to a girl's comments with a nod. They are also more likely to encourage boys to work through problems on their own, while they tend to step in and help girls who (7) with a problem. In an all-girls setting, girls are more likely to speak up frequently and make significant (8) to class than in a coeducational setting. Girls studying in a single-sex setting also earn higher scores on their College Board and Advanced Placement exams than girls who study in coeducational settings. All girls schools tend to be smaller than coeducational schools, which means teachers will be able to (9) the materials to girl students’ (10) learning styles and interest.

[音频]At just 12 years old, Mike Hannon is making a (1) in his community --one lunch at a time. “Mike's Lunches of Love” has fed more than 2 000 of the town's most (2) residents. Mike (3) meals to the homeless. “It's like a way to give people joy, maybe (4) something in them that can change them,” Mike told WBZ-TV. The mayor of Mike's town feels that Mike is a great community leader, especially in such times of so much (5) news. While his father (6) on how proud he was of his son，yet, Mike isn't looking for praise, but kindness in return. He hopes his acts of (7) will influence others to spread positive actions in their own towns. Mike includes a handwritten message of joy on each bag. His message and star power has (8) all over the country. To date, his online page to raise (9) has brought in more than $44 000 and counting, raising more than $17 000 in just one day, with the help of many famous actors and others. People from all over the country are sending special handcrafted bags to help the young man with his (10) to help those in need. Many are hoping the simple act of kindness spreads. Mike is seen as hope for the future of the town, the country and the world.

空气温度为t0,湿度为H0,相对湿度为φ0的湿空气,经一间接蒸汽加热的预热器后,空气的温度为t1,湿度为H1,相对湿度为φ1,则有( )

A. H1 >H0
B. φ0>φ1
C. H1 D. φ0<φ1