一个分数，它的分母是最小的合数，分子比分母少1，这个数是______，与这个分数

在右图所示的电路中，电源电动势为E，内电阻不能忽略。闭合S后，调整R的阻值，使电流表的示数增大ΔI，在这一过程中                                                                              （    ）

A．通过R的电流增大，增加量大于ΔI

B．通过R₁的电流减小，减小量一定为ΔI

C．R₂两端的电压增大，增加量为ΔIR₂

D．R₁两端电压减小，减小量小于ΔIR₂

—Granny, you look so weak. What's wrong with you?

—Terrible. The factory made ______ noise. It was _____ noisy that I couldn't sleep well last night. [ ]

A. too much, so

B. much too, so

C. too much, too

D. many, much

下列说法y，正确的是（　　）

A．有力作用在物体上，物体又沿某一方向移动了一段距离，那么这个力对物体做了功

B．某机械的功率为120W，表示该机械能做120J的功

C．功率越大的机械做功越快

D．静止的物体可能受到浮力的作用，而不可能受到升力的作用

On a cool November afternoon in Fleming Island, Florida, Melissa Hawkinson, 41, was driving her five-year-old twins home from school when she saw a sudden splash in Doctors Lake just ahead. What was that? She thought. As she drove up to the scene, she saw a half-submerged car sinking about 30 yards offshore. “It was going down pretty quickly,” Hawkinson recalls. She stopped the car near the boat ramp and ran toward the water. Water is going to be cold, she thought.

She took off her vest and leather boots, got into the icy water, and swam to the car, where she found Cameron Dorsey, five, trapped into his car as the swirling water rose around him.

Hawkinson tried to open the door, but it was locked. So she pushed and pulled hard on the partially open window until she could reach through and unlock the door. She pulled the boy free, swam to shore, and handed him off to onlookers who were only watching them on a dock. The driver, the boy’s suicidal father, swam back to land on his own. Afterward, Hawkinson sat on the shore wrapped in a blanket. “For ten or 15 minutes, I couldn’t stop shaking,” she said.

There’s nothing visibly extraordinary about Melissa Hawkinson, an energetic stay-at-home mom with brown hair and a sweet smile. Yet something made her different from the dockside onlookers that day. Why do some people act quickly, willing to take a risk for a stranger? What makes them run toward danger rather than away from it? Hawkinson, the Granite Mountain Hotshots (能手，高手)---19 of whom lost their life this past summer in Arizona--- every hero who puts his or her life on the line to save another: what makes them brave?

Moreover, can bravery be learned, or is it a quality with which you are born? The answer is complex. Bravery taps the mind, brain and heart. It comes from instinct, training and sympathy. Today, neurologists, psychologists and other researchers are studying bravery, trying to uncover the mystery.

小题1:It can be learned from the passage that _______.

A．Melissa Hawkinson was a 41-year-old nurse

B．it was spring when the accident happened

C．Melissa Hawkinson was picking up her five-year-old son

D．Melissa Hawkinson was kind and courageous.小题2:What conclusion can we draw from the third paragraph?

A．Not everyone was ready to risk saving the five-year-old boy..

B．The father committed suicide because of the divorce.

C．The father was saved in the end by Melissa Hawkinson.

D．No one else was available except Melissa Hawkinson.小题3:How does the writer find other people on the dockside?

A．Warm and ready to help

B．Thoughtful

C．Kind of cold-blooded

D．Not skillful at swimming小题4:What is the writer’s purpose of writing this passage?

A．To set us thinking what makes people brave.

B．To call on us to learn from such people as Hawkinson.

C．To remind people of risk while saving others.

D．To show people bravery can be learned.

亲子间需求矛盾正确的解决方法是（）。

A.双赢模式

B.权威法

C.纵容法

D.放弃法