問題詳情：
Do dogs understand us?
Be careful what you say around your dog. It might understand more than you think.
A dog__61__ (name) Rico recognizes about 200 objects, say researchers in Germany. The dog also appears to be able to learn new words as__62__ (easy) as a 3-year-old child.
In one experiment, the researchers took all 200 items that Rico is supposed to know and divided them into 20 groups of 10 objects. Then the __63__ (own) told the dog to go and fetch one of the items and bring __64__ back. In four tests, Rico got right 37 out of 40 commands.
In another experiment, the scientists took one toy that Rico had never seen before and put it in a room with seven toys whose names the dog already knew. The owner then told Rico to fetch the object, __65__ (use) a word the dog had never heard before.
The correct object was chosen in seven out of l0 tests, suggesting that the dog had worked out the answer by process of elimination(排除法). A month later, Rico remembered half of the new names, __66__ is even more impressive.
Rico __67__ (think) to be smarter than the average dog. For one thing, Rico is a border collie, __68__ breed (品種)known for its mental abilities. In __69__ (add), the 9-year-old dog has been trained to fetch toys by their names since the age of nine months.
It's hard to know if all dogs understand at __70__ (little) some of the words we say. Even if they do, they can't talk back. Still, it wouldn't hurt to sweet-talk your dog every now and then. You might just get a big, wet kiss in return!
【回答】
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