1. A feathered duck weighs about ()
First, 50 grams
B, 2 kg
C, 20 kg
D, 5 kg
Analysis: According to "feathered" ducks, they are basically adult ducks, but not adult ducks.
Answer: The adult duck weighs about 5 kilograms, and the newly feathered duck weighs about 2 kilograms. So choose B.
Comments: This question is a test of common sense in mathematics. The key is to mention whether "covered with feathers" means an adult duck.
2. This is a comprehensive test of chapter 1 in the first volume of the seventh grade of junior high school mathematics published by China Normal University.
3. Thinking about solving problems
We need to make a reasonable guess according to the known conditions, so as to get the answer.
We know that an adult duck weighs about 1 to 2 kg.
The duck in the title is covered with feathers, so we can guess that it has grown up.
So we can speculate that the weight of this feathered duck should be between 1 and 2kg.
So, the answer is: this feathered duck weighs about 1 to 2 kg.
Can this feathered duck swim fast in the water?
The swimming ability of ducks varies with species and individuals, but in general, ducks are good swimmers. Ducks with feathers usually live on land, but they also have good swimming ability. In water, feathers may provide some extra buoyancy and stability, but they don't adapt to life in water like special swimming birds.
However, ducks with feathers can usually swim very fast. Their feet and fins can help them push through the water. In addition, the size of ducks also helps them swim in the water.
Generally speaking, feathered ducks swim relatively fast in the water, but they may not swim as fast as some special swimming birds.