Tina and Mark noticed similar changes in their 14-year-old daughter. “She used to cuddle up (蜷伏)with me on the sofa and talk,” said Mark. “Now we joke that she does this only when she wants something. Sometimes she wants to be treated like a little girl and sometimes like a young lady. The problem is figuring out which time is which. ”

    Before age 11, children like to tell their parents what's on their minds. “In fact, parents are first on the list.” said Michael Riera, author of Uncommon Sense for Parents with Teenagers. “This completely changes during the teen years.” Riera explained. “They talk to their friends first, then maybe their teachers, and their parents last.”

    Parents who know what's going on in their teenagers' lives are in the best position to help them. To break down the wall of silence, parents should create chances to understand what their children want to say, and try to find ways to talk and write to them. And they must give their children a mental break, for children also need freedom, though young. Another thing parents should remember is that to be a friend, not a manager, with their children is a better way to know them.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

Dear Koko,

    I've learned about you from my amazing teacher. I think it's fun that you can communicate with us humans by using the sign language. I've spent a lot of time watching you in different videos and love you from the bottom of my heart.

    It's heartbreaking to learn about all of the cruel things done to gorillas (大猩猩). In Africa, for example, the killers use guns to kill your fellows for meat. They don't understand the influence their actions are having on gorillas. Another thing is the loss of gorillas' natural home, which is caused by the improved infrastructure such as building roads and airports. When we cut down trees, you become homeless. We take away your shelter and sources of food, leaving you with very little chance of survival.

    Some of my classmates are writing to the relevant departments about these serious problems. Hopefully these letters will make a difference during your lifetime. Over the past three months, my class has been researching on gorillas, and I've learned so many things. For example, I've learned that you have a lot of feelings similar to mine and you are always so careful with everything you do. I think that you are really worth saving.

    We've come up with many ideas to help you and your fellows. One of the best ideas is to communicate with the President of the World Bank and have him give more financial support to the organizations for gorillas. Another idea is to make public laws on the killers. I also think we need to keep educating people about gorillas.

    I love writing to you and hope you can understand how important you've become to our class. Would it be too much to ask for a return letter?

Mike

    Samuel Osmond is a 19-year-old law student from Cornwall, England. He never studied the piano. However, he can play very difficult musical pieces by musicians such as Chopin and Beethoven just a few minutes after he hears them. He learns a piece of music by listening to it in parts. Then he thinks about the notes(音符) in his head. Two years ago, he played his first piece Moonlight Sonata（奏鸣曲）by Beethoven. He surprised everyone around him.

    Amazed that he remembered this long and difficult piece of music and played it perfectly, his teachers say Samuel is unbelievable. They say his ability is very rare, but Samuel doesn't even realize that what he can do is special. Samuel wanted to become a lawyer as it was the wish of his parents, but music teachers told him he should study music instead. Now, he studies law and music.

Samuel can't understand why everyone is so surprised. "I grew up with music. My mother played the piano and my father played the guitar. About two years ago, I suddenly decided to start playing the piano, without being able to read music and without having any lessons. It comes easily to me —I hear the notes and can bear them in mind—each and every note," says Samuel.

Recently, Samuel performed a piece during a special event at his college. The piece had more than a thousand notes. The audience was impressed by his amazing performance. He is now learning a piece that is so difficult that many professional(专业的) pianists can't play it. Samuel says confidently, "It's all about super memory—I guess I have that gift."

    However, Samuel's ability to remember things doesn't stop with music. His family says that even when he was a young boy, Samuel heard someone read a story, and then he could retell the story word for word.

    Samuel is still only a teenager. He doesn't know what he wants to do in the future. For now, he is just happy to play beautiful music and continue his studies.

Three Feet From Gold

    Darby's uncle was caught by the "gold fever" in the gold—rush days, and went west to dig and grow rich. After months of labor, he was rewarded by the discovery of the shining ore (矿石). He needed machinery to bring the ore to the surface. So, with the "strike", he returned home. And with the help of Darby, he borrowed a lot of money. After buying the machinery and having it shipped, Uncle and Darby went back to work the mine.

    The first car of ore was mined. And the returns proved they had one of the richest mines in Colorado! Down went the drills! Up went the hopes of Uncle and Darby!

    Then something happened! The vein (矿脉) of gold ore disappeared! They drilled on, but all in vain. Finally, they decided to quit and sold the machinery to a junk man for a few hundred dollars. The junk man called in a mining engineer to look at the mine and do a little calculating. The engineer's calculations showed that the vein would be found just three feet from where the Darbys had stopped drilling! The junk man took millions of dollars in the vein, because he knew enough to seek experts' advice before giving up.

    Most of the money which went into the machinery was borrowed through the efforts of Darby, who was then a very young man. The money came from his relatives because of their faith in him. He paid back every dollar of it, although he was years in doing so.

    Long afterwards, Mr. Darby made another discovery that desire can be changed into gold. This discovery came after he went into the business of selling life insurance. Remembering that he lost a huge fortune, for he stopped three feet from gold, Darby profited by the experience in his chosen work, saying to himself, "I stopped three feet from gold, but I never stop because men say 'no' when I ask them to buy insurance."

    Darby sold more than million dollars in life insurance annually. He owes his "stick-ability" to the lesson he learned from his "quit-ability" in the gold mining business.

    Despite what so many people would love to believe, NASA hasn't discovered any evidence of past or present intelligent life on Mars. Therefore, when the Curiosity rover (好奇号探测器) found something suspicious on the Red Planet's surface, they were not only surprised but also a little bit worried.

    The thin fragment(碎片) was suspicious enough to guarantee its own name, with NASA's Curiosity rover team calling it the "Pettegrove Point Foreign Object Debris", named for where it was discovered. With no idea what it was or where it came from, the rover's handlers began to worry that it might actually be a piece of the rover itself, suggesting some unseen damage or other issue with the robot. Thankfully, those concerns seem to have been unfound.

    In a new update from NASA the object has now been identified as a natural piece of rock rather than a piece of any man-made craft or vehicle. The team analyzed the unusual object with a tool called the Chem Cam RMI. The instrument uses a laser (激光器)to sniff out the makeup of anything that is pointed at, and the results for this particular piece of debris revealed that it's actually just a very thin piece of rock.

    NASA describes the inspection: The planning day began with an interesting result from the previous plan's Chem Cam RMI analysis of a target that was referred to as "Pettegrove Point Foreign Object Debris"(PPFOD)，and supposed to be a piece of spacecraft debris fact. In fact it was found to be a very thin slice of rock, so we can all rest easy tonight. Curiosity has not begun to shed its skin!

    How this particularly thin sliver of rock got to where it is—and why it seems to be a different colour than the surrounding sand and debris—remains unexplained, but at least the rover isn't falling apart.