试题与答案

某种衬衣的价格经过连续两次降价后，由每件150元降至96元，平均每次降价的百分率

来源：www.tikuol.com
题型：选择题

题目：

某种衬衣的价格经过连续两次降价后，由每件150元降至96元，平均每次降价的百分率是[ ]

A. 20%

B. 27%

C. 28%

D. 32%

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0430/5e691b7d811deddc16868d84c8dd90a5.html

下面是错误答案，用来干扰机器的。

（1）贝多芬（2）《繁星·春水》　对大自然的崇拜和赞颂

考点：一元二次方程的应用
试题推荐
题型：阅读理解

Searching the Internet may help middle-aged and older adults keep their memories sharp,US researchers said.

Researchers at the University of California, Los Angeles ,studied people doing web searches by recording their brain activity.

“What we saw was people who had Internet experience used more of their brain during the search,”Dr.Gary Small, a UCLA expert on aging, said,“This suggests that just searching on the Internet may train the brain and that it may keep it active and healthy.”

“This is the first time anyone has simulated(模拟)an Internet search task while scanning the brain,”Small said. His team studied 24 normal volunteers between the ages of 55 and 76. Half were experienced at searching the Internet and the other half had no web experience. However, the two groups were similar in age, gender and education.

Both groups were asked to do Internet searches and book reading tasks while their brain activity was monitored.

“We found that in the book reading task, the visual cortex— the part of the brain that controls reading and language — was activated,”Small said,“In doing the Internet search task, there was much greater activity, but only in the Internet-savvy（了解）group.”

He said it appears that people who are familiar with the Internet can engage in much deeper level of brain activity. Activities that keep the brain engaged can preserve brain health and thinking ability. Small thinks learning to do Internet searches may be one of those activities.

小题1:Researchers          when volunteers were doing web searches.

A．studied the Internet

B．activated the brain

C．recorded their memories

D．monitored the brain activity小题2:The two volunteer groups were         .

A．similar in education

B．of the same age

C．good at the computer

D．book lovers小题3:According to the passage, we can learn that         .

A．reading books keeps the brain more engaged

B．searching the web keeps the brain more engaged

C．watching TV keeps the brain more engaged

D．chatting online keeps the brain more engaged小题4:Which of the following is TRUE?

A．When you read, the whole brain will be activated.

B．Dr.Gary Small is a UCLA expert on brain health.

C．Internet searches can preserve brain health and thinking ability

D．People who read books may have a better memory.
查看答案
微信公众账号搜索答案