二氧化碳跨膜运输的方式是() A.主动运输 B.自由扩散 C.协助扩散 D.胞吞与胞

题型:单项选择题

问题:

二氧化碳跨膜运输的方式是()

A.主动运输

B.自由扩散

C.协助扩散

D.胞吞与胞吐

考点:高中生物物质进出细胞的方式物质进出细胞的方式题库
题型:单项选择题

“五岳”中位于黄土高原的是[ ]

A、泰山

B、衡山

C、华山

D、嵩山

题型:单项选择题

阅读理解。

     Sports shoes that work out whether their owner has done enough exercise to warrant time in front of

the television have been devised (发明;想出) in the UK.

     The shoes- named Square Eyes- contain an electronic pressure sensor and a tiny computer chip to

record how many steps the wearer has taken in a day. A wireless transmitter passes the information to

a receiver connected to a television, and this decides how much evening viewing time the wearer deserves, based on the day's efforts.

     The design was inspired by a desire to fight against the rapidly ballooning waistlines among British

teenagers, says Gillian Swan, who developed Square Eyes as a final year design project at Brunel

University in London, UK. "We looked at current issues and childhood overweight really stood out," she

says. "And I wanted to tackle that with my design."

     Once a child has used up their daily allowance gained through exercise, the television automatically

switches off. And further time in front of the TV can only be earned through more steps.

     Swan calculated how exercise should translate to television time using the recommended daily

amounts of both. Health experts suggest that a child take 12,000 steps each day and watch no more than

two hours of television. So, every 100 steps recorded by the Square Eyes shoes equals precisely(精确

地)one minute of TV time.

     Existing pedometers(计步器) normally clip onto a belt or slip into a pocket and keep count of steps

by measuring sudden movement. Swan says these can be easily tricked into recording steps through

shaking. But her shoe has been built to be harder for lazy teenagers to cheat. "It is possible, but it would

be a lot of effort," she says. "That was one of my main design considerations."

1. According to Swan, the purpose of her design project is to _____. 

A. keep a record of the steps of the wearer.

B. deal with overweight among teenagers.

C. enable children to resist(抵制) the temptation of TV.

D. prevent children from being tricked by TV programs.

2. Which of the following is true of Square Eyes shoes?  

A. They regulate(调整)a child's evening TV viewing time.

B. They determine a child's daily pocket money.

C. They have raised the hot issue of overweight.

D. They contain information of the receiver.

3. What is stressed(强调) by health experts in their suggestion?

A. The exact number of steps to be taken.

B. The precise number of hours spent on TV.

C. The proper amount of daily exercise and TV time.

D. The way of changing steps into TV watching time.

4.  Compared with other similar products, the new design ___. 

A. make it difficult for lazy teenagers to cheat.

B. counts the wearer's steps through shaking.

C. records the sudden movement of the wearer.

D. sends teenagers' health data to the receiver.

5. Which of the following would be the best title for the text? 

A. Smart Shoes Decide on Television Time

B. Smart Shoes Guarantee(保证)More Exercise

C. Smart Shoes Measure Time of Exercise

D. Smart Shoes Stop Childhood Overweight

题型:单项选择题

若将关系模式Student分解为(S no,S name),(C no,C name),(S no,C no,T name),(S no,C no,Grade), (T name,Taddr)五个关系模式,则(Sno,Cno,Tname)的规范化程度最高达到( )。

A.4NF
B.2NF
C.3NF
D.BCNF

题型:单项选择题

人力资源供给小于需求时,其措施不包括()。

A.提高现有员工的工作效率

B.从外雇佣人员

C.缩短工作时间、工作分享或降低员工的工资

D.将组织的某些人力资源业务外包

题型:单项选择题

日常生产中常以烧结矿中FeO含量来表示还原性,FeO增加,还原性()。

A、变好

B、变差

C、不变

D、以上说法都正确

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