问题 单项选择题

根据有效数字的四则运算规则,几个数字相加或相减时,下列说法中,错误的是()。

A.几个数字相加或相减时,以有效数字位数最少的数为标准,弃去过多的位数,然后进行加减

B.其和或差的有效数字保留的位数,应以绝对误差最大的那个数为标准

C.其和或差的有效数字保留的位数,应以相对误差最大的那个数为标准

D.其和或差的有效数字保留的位数,应以小数后位数最少的那个数字为依据

答案

参考答案:C

阅读理解

On April 20th,2013, a big and powerful earthquake attacked Ya’an, Sichuan Province. A great many buildings and houses collapsed, a lot of people were killed and even more people lost their homes in the earthquake .

The number of the death from the 7.0-magnitude earthquake that hit Ya’an in southwestern China's Sichuan Province has risen to 188, according to latest calculations by local Civil Affairs Bureau(as of 18:00 pm, April 22, ). At least 11,826 were reportedly injured in the quake while 25 are still missing.

Experts are anticipating(预期的)much less casualties(人员伤亡)in the quake than that from the 8.0 magnitude quake hit Wenchuan on May 12, 2008, also in Sichuan Province, which killed more than 80,000 and injured over 300,000.

Energy released from Wenchuan earthquake would be 30 times of that from Ya’an quake, according to Zhang Xiaonan, an expert with China's Geophysical Union. Dai Junwu with Harbin-based seismological bureau (地震局)expects the number of the death at less than 1,000, and economic losses from the quake could reach up to 100 billion yuan.

Rescue(营救)efforts were carried “timely and orderly”, said Chinese Premier Li Keqiang who flew to the quicken-stricken area on Sunday, the second day of the quake. He was quoted as saying that “the current priority is to save lives”.

小题1:When did Ya’an earthquake happen?  

A.April 22,2008

B.April 20,2013

C.May 12,2008

D.May.22 2013小题2: How many people injured in the earthas of 18:00 pm, April 22 ) according to the   passage?    

A.About188

B.At least 11,826

C.More than 80,000

D.Over 300,000.小题3:What does the underlined word “ collapsed” in para.1) mean?

A.fell down suddenly

B.Rebuilt

C.burnt to the ground

D.turned into pieces小题4:Which one is NOT true according to the passage?

A.Wenchuan earthquake released 30 times energy of Ya’an earthquake.

B.Premier Li Keqiang who flew to the quicken-stricken area on April,21,2013.

C.Wenchuan earthquake killed around 80000 people.

D.Zhang Xiaonan expected the economic losses from the quake could reach up to 100 billion yuan.

单项选择题