1 . In a story from Aesop’s Fables (伊索寓言), a thirsty crow (乌鸦) drops stones into a narrow bottle to raise the low level of water inside so he can take a drink.
Now scientists have experiments to back up that story. The experiments show that crows actually do understand how to make water displacement (排水量) work to their advantage. The results suggest that the birds are, at least in some cases, as smart as first-graders.
Researchers, led by Sarah Jelbert at the University of Cambridge, presented six crows with bottles, containing water. Inside the bottles, a piece of meat on a piece of wood was floating (漂浮), just out of reach of the crows. In front of the bottles, the researchers arranged several rubber erasers that would sink, and some plastic objects that would float. The crows found out that they could drop the erasers into the bottles in order to raise the water level and get their meat.
However, the birds were awkward in experiments in which they could choose to drop objects in either a wide bottle or a narrow one to get the meat, the researchers said. Dropping objects into a narrow bottle would lift the water level by a greater amount and put the treat within reach after just two drops; while it took around seven drops to raise the meat to the same level in the wide bottle. The crows obviously didn’t realize this, and most of them went for the wide bottle first.
Previous studies showed that chimps (大猩猩) and human children can solve similar tasks. In a 2011 study, chimps and kids found out that they could put water into a bottle to reach a peanut that was floating in a small amount of water at the bottom.
1. What does the text focus on?| A．The truth of Aesop’s fables. | B．Crows’ intelligence. |
| C．The development of crows. | D．Human-animal communication. |
| A．By breaking the bottle. | B．By dropping erasers. |
| C．By standing on the wood. | D．By removing the wood. |
| A．The bottle. | B．The objects. | C．The meat. | D．The water. |
| A．Crows are unable to tell different shapes. |
| B．Crows prefer narrow bottles. |
| C．Crows are good at counting numbers. |
| D．Crows are not clever all the time. |
| A．crows are as smart as them. |
| B．crows are smarter than them. |
| C．crows are less smart than them. |
| D．crows can not be compared with them. |
2 . As you're busy with your studies, the weeks during the Spring Festival can be a time when training and healthy eating plans go out of the window. But you can continue running and avoid weight gain during the holiday season.
Pick a race
Having a race on your calendar (日历) is a motivation（动机） to keep running during the holiday.
Don't skip breakfast
If you're going to a holiday party in the evening, don't make the mistake of skipping breakfast.You may think you're saving calories for later.
Bring your own healthy dishes
Chances are that most of the dishes at holiday gatherings are going to be high in taste and calories. Bring your own healthy appetizers(开胃菜) to the party. The host will appreciate it, and you know there will be at least one wise choice on the buffet table.
If you're heading to an evening event, eat regular(规律的) meals and snacks every few hours up until party time. You won't arrive at the party ready to attack appetizers. Make sure you include fiber at each meal because it keeps you full longer.
Plan your runs
It's easy to say that you'll keep running regularly during the holiday season, but sticking to it requires a strategy. Schedule your runs like appointments, so you make them the first thing during a busy week.
| A．Treat yourself |
| B．Eat small meals |
| C．Try some or all of these strategies (策略) |
| D．In fact, it may lead to overeating later in the day |
| E．Buy yourself a gift of some new running shoes and clothes |
| F．Once you choose one that is in a few weeks, set a plan and stick to(坚持) it |
| G．If you have runs scheduled, you are more likely to get them done |
