题目内容：

    We’re reading a book or opening an envelope when, all of a sudden, there’s a sharp pain on our finger. You see a little bit of blood and realize you’ve just gotten a paper cut.

Dr Hayley Goldbach, a resident dermatologist at UCLA Health, spoke about why paper cuts are so jagged, how the element of surprise leaves us in more pain and how to make sure they heal quickly.

Dr Goldbach explained that one reason paper cuts hurt so much is where they occur: primarily on the finger. We have nerve endings all over the body, "she said. "In places where there is refined movement and sensation--like the lips or tips of the fingers-they have a high density of nerve endings. ” These nerve endings are known as nociceptors and they send signals to the brain about things that could cause a break in the skin, such as extreme hot or cold temperatures and chemicals.

Another reason why paper cuts hurt so much is that you re using your hands throughout the day meaning that the wound is constantly getting opened. "You often get paper cuts on the pad or the tip of the finger, different from where you d get a knife cut, "said Dr Goldbach. " It's hard not to use your hands, so there’s constant pressure on the wound without u chanee for it to heal. "

“The paper itself is another reason why these superficial cuts leave us in so much pain. Paper might look and seem smooth but, if you study it under a microscope, the edge is actually jagged. "Paper is quite sharp jagged-it's a bit of serrated edge, "said Dr Goldbach. "It cuts you pretty quickly before you have the chance to realize it. ”

Additionally, paper cuts are quite shallow, which makes them even more annoying to deal with.

Dr Goldbach added that there are mental and emotional elements that cause paper cuts to hurt more than other cuts. "There’s the psychological element of surprise, and it happens so quickly that you don’t have time to withdraw your hand "she said " With some other injuries, you feel pressure so you have time to react. ”

She also added that because we don’t expect to hurt ourselves while working with paper, the surprise of cuts leaves us in further pain. "We tend to be careful with a knife-you’re being careful on purpose: because you know there: s a danger, "said Dr Goldbach. While we are careful with knives, we are not so careful with paper.

1.The underlined word "jagged" is closest in meaning to ______.

A. sharp B. not dull

C. not rough D. not smooth

2.How many reasons why paper cuts hurt so much are mentioned in the passage?

A. Three. B. Four.

C. Five. D. Six.

3.What will the following passage be about?

A. How to deal with paper cuts.

B. How to prevent paper cuts.

C. how to make sure paper cuts heal quickly.

D. The different pains caused by knife cuts and paper cuts.