题目内容
【题目】我国各季河流结冰与不结冰的分界线是（ ）
A．伏牛山 B．喜马拉雅山 C．泰山 D．秦岭
【答案】D
【解析】
试题分析：秦岭、淮河一线是我国四大区域中，南方地区与北方地区的分界线；一月份0℃等温线通过的地方；800mm等降水量线通过的地方；温度带中，暖温带与亚热带分界线；干湿地区中，湿润区与半湿润区分界线；温带季风气候与亚热带季风气候分界线；亚热带常绿阔叶林与温带落叶阔叶林的分界线；耕地中水田和旱地的分界线等．
解：以秦岭﹣淮河为界，以南地区的河流流经湿润地区，水量丰富，汛期长，含沙量少，冬季河流不结冰．以北地区的河流流经半湿润或半干旱地区，水量不大，汛期较短，且冬季河流有结冰现象．
故选：D．
100分闯关期末冲刺系列答案
【题目】
| This boy demonstrated his invention a pen with a reading glass，in Harbin on January 20，2009.Over 16 small inventions have been made since a training course was opened at the Science Palace in Harbin in November，2008. |
| This boy's invention，which can cut an apple into pieces，was demonstrated in Harbin on January 20，2009. |
| This boy invented a musical alarm clock which he demonstrated in Harbin on January 20，2009. |
| This small car was invented in March，2010 by a college student.It has 250 cm long and 100 cm wide.The car weighs less than 50 kg.It only has one seat. |
【1】When was the training course opened at the Science Palace in Harbin?
A. In January，2009. B. In November，2008.
C. In May，2009. D. In March，2010.
【2】Which invention is the latest?
A. The small car with one seat.
B. The musical alarm clock.
C. The pen with a reading glass.
D. The machine which can cut apples into pieces.
【3】The third boy invented something that can help people ________.
A. cut an apple into pieces
B. wake up every morning
C. take the bus conveniently
D. see words clearly
【4】The underlined word “demonstrated” in the passage means “________”．
A. showed B. drew C. imagined D. divided
【5】The passage mainly talks about ________.
A. several new inventions
B. students' school life
C. the training course in Harbin
D. the Science Palace in Harbin
