关于功和能的关系，下列说法正确的是　[] A．物体具有的能越多，它做的功越多

如图所示，小明与小红用细棉线连接了两个纸杯，制成了一个“土电话”．

（1）他们用“土电话”能实现10m间的通话，这表明______．

（2）相距同样远，讲话者以同样的响度讲话，如果改用细金属丝连接土电话，则听到的声音就大些．这一实验现象表明______．

（3）如果在用土电话时，另一个同学用手捏住线上的某一部分，则听的一方就听不到声音了，这是由于______．

（4）如果在用土电话时，线没有拉直而处于松驰状态，则听的一方通过棉线______（选（填“能”或“不能”）听到对方的讲话声．理由是：______．

右图为某地正午太阳高度角的年变化示意图，读图回答5～7题。

5．以下关于该地所在半球与热量带的描述，正确的是

A．北半球  温带    B．南半球  温带   

C．北半球  热带    D．南半球  热带

6．以下关于P、Q、M、N四点取值的判断，正确的是

A．P与M的值相等，且可能小于66°34′

B．N为一年中正午太阳高度角的最小值，且应小于43°08′

C．P与M的值均为90°

D．Q的值应小于66°34′

7．当该地的正午太阳高度取何值时，昼夜分布情况可能如右图

所示，并指出此时赤道上月出的点

A．正午太阳高度取值为P   赤道上A点月出

B．正午太阳高度取值为M   赤道上B点月出                   

C．正午太阳高度取值为Q   赤道上C点月出

D．正午太阳高度取值为Q   赤道上D点月出

In a six-week study, experts found people who played online games designed to improve their cognitive(认知的) skills didn't get any smarter.

More than 8,600 people aged 18 to 60 were asked to play online brain games designed by the researchers to improve their memory, reasoning and other skills for at least 10 minutes a day, three times a week. They were compared to more than 2,700 people who didn't play any brain games, but spent a similar amount of time surfing the Internet and answering general knowledge questions. All participants were given a sort of I.Q test before and after the experiment.

Researchers said the people who did the brain training didn't do any better on the test after six weeks than people who had simply been on the Internet. On some sections of the test, the people who surfed the Net scored higher than those playing the games.

"If you're (playing these games) because they're fun, that's absolutely fine," said Adrian Owen, the study's lead author. "But if you're expecting (these games) to improve your I.Q., our data suggests this isn't the case," he said during a press briefing on Tuesday.

One maker of brain games said the company's games have been proven to boost brain power.

"Their conclusion would be like saying, 'I cannot run a mile in under 4 minutes and therefore it is impossible to do so," Aldrich said in a statement.

"There is precious little evidence to suggest the skills used in these games transfer to the real world," said Art Kramer, who was not linked to the study and has no ties to any companies that make brain training games.

Instead of playing brain games, Kramer said people would be better off getting some exercise. He said physical activity can spark(激发) new connections between nerves and produce new brain cells. "Fitness changes the building blocks of the brain's structure," he said.

小题1:. It can be inferred that the online brain games mentioned in the text are_____________.

A．costly

B．unreliable

C．illegal

D．effective小题2:. Which of the following statements is true about the experiment in the second paragraph?

A．The experiment lasted for a week.

B．Age didn’t affect the result of the research.

C．Every person played online brain games three times a day.

D．People who didn’t play online brain games did better in I.Q test小题3:. What can we learn from the text?

A．Playing games which are fun can improve your I.Q.

B．There is a lot of evidence to suggest skills can transfer to the real world.

C．Do physical activity can boost your brain power.

D．Playing online games can spark new brain cells小题4:The underlined sentence suggests that ___________.

A．The research was not linked to the study

B．Those playing the games can score higher in the test

C．playing the games can spark new connections between nerves

D．This isn’t the case that these games can improve your I.Q.

高速公路车道数以（）为最佳。

A、二条

B、三条

C、四条

骨筋膜室综合征的临床表现和治疗原则有哪些？