题目内容
But often the drivers just go by, taking the human traffic for granted
- A.sign
- B.symbol
- C.signal
- D.mark
试题分析:考查名词:A. sign标志,B. symbo象征,l C. signal信号, D. mark记号,句意:但是经常司机就是从旁边经过,对人类的交通信号不以为然。选C。
考点:考查名词
Which animal has the fastest snapping jaw (颚)? If you're guessing a shark or perhaps a larger animal, you'll have to think smaller. The trapjaw ant, which lives in Central and South America, moves its mouth parts at 35 to 63 meters per second. Another way to think about this is that the ant's jaws close at 125 to 233 kilometers per hour. That's 2, 300 times faster than the blink of an eye.
Scientists were able to measure the amazing jaw speed using highspeed video techniques. Sheila Patek, a biologist, says the key is that the jaws have a springy (有弹性的) system, which is critical in getting explosive (爆发性的) speeds.
Consider a bow and arrow. If you try to throw an arrow with your arm, it won't go very far. If you use a bow, elastic energy stored in the bow is released almost instantly when you release the arrow with your finger or a latch. The combination of the springy bow and latch mechanism is what makes the arrow zoom through the air.
Maybe even more amazing than how fast these ants grab food or even enemies is how they use this same energy to move. As the ant closes its jaws, it uses them to push off the ground—all faster than the eye can see without slow motion video. A snap of the jaw can send an ant up to 8.3 centimeters into the air. That's like someone who is 1.7 meters jumping 13 meters high! Not only can they quickly escape from enemies, but often a group of ants will start jumping all at once. It would be hard for their enemies to grab just one.
People have suspected the ants used their jaws to jump for over a century, but could only prove it with today's modern video equipment.
【小题1】The fast speed of the trapjaw ant's jaw lies in ________.
| A.its light body |
| B.its springy system |
| C.its living environment |
| D.the length of its jaw |
| A.how an arrow gets so much energy to fly |
| B.why the trapjaw ants have springy system |
| C.why the trapjaw ants jaws move so fast |
| D.how a bow and arrow works |
| A.How high the ants can leap by using their jaws. |
| B.How quickly the trapjaw ants can move on the ground. |
| C.How wonderfully the springy system in the trapjaw ants' jaws works. |
| D.How quickly the trapjaw ants can grab food or enemies. |
| A.they can catch their enemies easily with their jaws |
| B.their jaws make them difficult to recognize |
| C.their jaws help them find food easily |
| D.their jaws help them escape from their enemies |
The Most Direct Solution to Any Problem
When trying to solve various problems in life, an approach I find very useful is to first identify what I’d consider the most direct solution, regardless of how I feel about actually implementing (实施) it. What is the clearest, most direct path to my goal or the most efficient way to get around an obstacle?
Many problems will have multiple direct solutions, but often these solutions will be unpleasant at first glance because they’ll require courage, self-discipline, creativity, or persistence to implement. 【小题1】
For example, suppose you want to lose weight. And suppose we can say that one of direct solutions is to eat the same as you’re eating now and increase your exercise output by 500 calories a day. 【小题2】 It may require discipline and persistence, but most people would agree that it will work if you follow through.
Another example: 【小题3】 However, you don’t know how that person feels about you. One direct solution would be to simply walk up, explain your thoughts and feelings, and ask if she or he is interested in discussing the possibility of a closer relationship. This will take less than a minute to say, and whatever the outcome is, at least you know where you stand. 【小题4】 Anyhow it’s very simple and straightforward.
【小题5】 What’s the simplest and quickest way to reach your goal, assuming that you had limitless courage and discipline?
| A.Of course this solution may require a lot of courage toovercome the possibility of rejection. |
| B.But if we can get ourselves to follow through, we know the solutions will actually work. |
| C.See if you can identify the most direct solution to some of your problems. |
| D.So the best way to overcome the difficulty is to ask your friends for advice. |
F. Suppose you’re interested in starting a relationship with someone.
G. However, the solution implemented does not work.