搜题请搜索小程序“爱下问搜题”
问题 选择题

下列图①-④分别与相应的操作过程相对应，其中错误的是                    

[ ]

A．①在恒温的条件下，将足量的硝酸钾饱和溶液蒸发一定量的水

B．②向一定质量盐酸中加入过量石灰石

C．③向一定量的碳酸钠溶液中加入稀盐酸

D．④向 等质量且过量的锌粉和铁粉中，分别加入等质量且质量分数相同的稀盐酸

答案

答案：B

有人形象地说南京既是中国近代史的起点,也是中国近代史的终点,下面能够反映这种说法的两个历史片断是

①国近代第一个不平等条约的签订。

②国民政府成立。

③中国民国成立。

④日本法西斯在此制造了掺绝人寰的“大屠杀”。

⑤人民解放军占领南京国民政府“总统府”。

A．①⑤

B．②④

C．③④

D．③⑤
查看答案
单项选择题

The girls in this sixth grade class in East Palo Alto, California, all have the same access to computers as boys. But researchers say, by the time they get to high school, they are victims of what the researchers call a major new gender (性别) gap in technology. Janice Weinman of the American Association of University Women says, "Girls tend to be less comfortable than boys with the computer. They use it more for word processing rather than for problem solving, rather than to discover new ways in which to understand information."

Girls often feel ______.
A. bored with computer games
B. comfortable using computers
C. it hard to use computers in word processing
D. worried about using computers

After re-examining a thousand studies, the American Association of University Women researchers found that girls make up only a small percentage of students in computer science classes. Girls consistently rate themselves significantly lower than boys in their ability and confidence in using computers. And they use computers less often than boys outside the classroom.An instructor of a computer lab says he’s already noticed some differences. Charles Cheadle of Cesar Chavez School says, "Boys are not so afraid they might do something that will harm the computer, whereas girls are afraid they might break it somehow."
Six years ago, the software company Purple Moon noticed that girls’ computer usage was falling behind boys. Karen Gould says, "The number one reason girls told us they don’t like computer games is not that they’re too violent, or too competitive. Girls just said they’re incredibly boring."
Purple Moon says it found what girls want, characters they can relate to and story lines relative to what’s going on in their own lives. Karen Gould of Purple Moon Software says, "What we definitely found from girls is that there is no intrinsic (固有的) reason why they wouldn’t want to play on a computer; it was just a content thing."
The sponsor of the study says it all boils down to this: the technology gender gap that separates the girls from the boys must be closed if women are to compete effectively with men in the 21st century.
查看答案