阅读下文，回答相关问题。

                                                                                         伯乐就是你自己
       ①慧眼识珠者为人景仰，知人善任者功德无量。然而茫茫人海之中，这样的“伯乐”却往往是可遇而不可求。韩愈说：“世有伯乐，然后有千里马。”我却要说：“千里马，你要做自己的伯乐！”
       ②美国著名心理学专家安东尼·罗宾曾经在《唤醒心中的巨人》一书中指出：“每个人身上都蕴藏着一份特殊的才能。那份才能犹如一位熟睡的巨人，等待着我们去唤醒他……上天不会亏待任何一个人，他给我们每个人以无穷的机会去充分发挥自己。”既然如此，我们还等什么，为什么不去做自己的伯乐呢？
       ③当代著名作家贾平凹有一句名言：“人贵能自我发现。”也就是说，你要做自己的伯乐。他本人经过多年的左冲右突，发现了自己写作方面的才能，寻求到一条通往成功的道路。正是因为他发现了自己，才勇敢地将自己的才能展示给了众人，他就是自己的伯乐！
       ④毛遂地位卑微，却果敢得令人钦佩，在赵国被秦军围困的关健时刻，他不顾旁人的鄙夷和耻笑，挺身而出，鼎力自荐。楚国宫殿之上，他凭借自己“三寸不烂之舌”，说服楚王出兵，救国民于水火之中，留下了“小蔺相如”的美称。毛遂之所以能够名垂千古，正是因为他敢于发现自我，欣赏自我，敢于做自己的伯乐。
       ⑤如果你是一匹“千里马”，千万别把希望寄托在别人身上，当义无反顾地向毛遂学习，做自己的伯乐，发现自己的才能，然后以百倍的信心和勇气，把自己“荐”出去，去一展自己的风采，去实现自己的抱负。万万学不得那个才高八斗、计谋超群的姜子牙，他用几乎一生的时间来等待伯乐发现自己，要不是在垂老之年偶遇周文王，他的才华险些就被自己的消极等待给埋没了。
       ⑥我们常常惊羡别人的成功，却（ 往往）忽视自己的努力；(常常)嘴叹命运不公，却很少发掘自己的潜质。那么，从现在起做自己的伯乐吧，别让自己把自己理没，努力地去发现自己的天赋和潜能，并将其发扬光大。把我们心中的巨人唤醒，让我们发现自己、赏识自己，看准正确的人生方向，一步一个脚印往前走，总有一天，我们会走进自己心中的圣殿。
                                                                                                              （作者：赵锁仙，有删改）

    Gravity signals that race through the ground at the speed of light could help seismologists(地震学家) get a better handle on the size of large, destructive quakes soon after they hit，a study suggests. The tiny changes in Earth's gravitational field, created when the ground shifts, arrive at earthquake monitoring stations well before earthquake waves.

    “The good thing we can do with these signals is have quick information on the magnitude (震级) of the quake,” says Martin Vaillée, a seismologist at the Paris Institute of Earth Physics.

    Earthquake equipment in China and South Korea picked up gravity signals immediately after the magnitude-9. 1 Tohoku earthquake that destroyed parts of Japan in 2011. The signals appear as tiny accelerations on earthquake-recording equipment, more than a minute before the seismic waves show up.

    “We can look before the earthquake waves arrive,” says Vallée. “If we see nothing, we can say that the quake that made these was maybe large, but not huge. If we see the signals, it means we really have a very big quake. ”

    Had seismologists been monitoring for gravity changes, they might have realized sooner just how big the Tohoku earthquake was. A small increase in an earthquake's magnitude means a large change in the energy released by the quake-and the destruction expected. That information is important for emergency responders as they decide what resources to arrange.

    It'll be a major contribution if gravitational waves can beat down the time needed to know that a big earthquake is big. But much work remains before gravity signals can be considered a reliable tool in the vital minutes after a big quake. A few extra minutes of warning can save lives, particularly in coastal areas where people can flee ahead of an incoming tsunami.

金刚砂（SiC）结构与金刚石结构相似，若将金刚石晶体中一半的C原子换成Si原子且同种原子不成键，则得到金刚砂（SiC）结构．

①SiC是 ____晶体，键角是　 ____　．

②如果我们以一个硅原子为中心，设SiC晶体中硅原子与其最近的碳原子的最近距离为d，则与硅原子次近的第二层有　 ____个原子，离中心原子的距离是 ____