若复数(a2-4a+3)+(a-1)i是纯虚数,则实数a的值为 ( )
A.1
B.3
C.1或3
D.-1
答案:B
下列各句中没有错别字的一项是( )
A.一篇题为《题纲挈领有效复习》的文章这样说道:记忆的内容要注意“抓大放小”,不能“胡子眉毛一把抓”。在最后这段时间里,不要纠缠于细微的知识点,而要抓住大的方面。
B.大自然鬼斧神工地锻造出宫马溶洞这一绝美的境地。凝结的冰面下,有幽咽的泉流声传出;海鱼挂壁、掣天一柱等景观令人惊叹不已、目不暇接。
C.大度是一种做派,一种浅薄者绝难企及的人生境界。蔡元培鄙弃罢黜百家的文化专制,提倡学术自由,含而不露,相信自己稳操胜券,故从容不迫。
D.春天,我在这片土地上,用我细瘦的胳膊,紧扶着我锈钝的犁。深埋在泥土里的树根、石块,磕绊着我的犁头,销耗着我的体力。我汗流浃背,四肢颤抖……
第二节语法填空(共10小题,每小题1.5分,满分15分)
阅读下面短文,根据上下文填入适当的词语,或使用括号中的词语的适当形式填空,并将答案填写在答题卡上标号为31-40的相应位置。
Jean is a 17-year-old high school student. On Saturday mornings, Jean and her friends take part in the program 31 (call) SAVE THE KIDS. They travel to a poor area of Washington D.C. They help younger students learn 32 to read and to solve mathematics problems. Many American teenagers join in programs 33 serve their communities. On weekends Jean sometimes works at an ice-cream store. When she is not working, she gets together with her girlfriends. They might go to a movie, to a shopping mall or to an eating place. Or they might attend 34 sports event of their high school. They also often stay at one girl’s house for the night.
35 teenagers in most parts of the country, Jean began driving a car when she was 16 years old. She does not have her car, however. She must 36 the family car with her parents. About 70 percent of American teenagers have their own cars. Many of them drive their cars to school every day. Jean does not smoke cigarettes 37 drink alcohol. 38 do her friends. But many teenagers at her school do. Drinking alcohol is a major problem there. Every weekend teenagers have parties, where they drink alcohol. Then they drive to other parties. People under the age of 21 39 (not allow) to drink alcohol in the United States. And it is 40 (danger) to drink and drive a car. Yet this does not stop some teenagers.