题目内容

According to paragraph 6, which of the following is true about the wings of birds？

All birds flap their wings constantly by using breast muscles.
B. Eagles and hawks have wings that propel them at 170 km/hr.
C. The airfoils of birds function like the wings on airplanes.
D. Wings are attached to airfoils in the bird's skeletal structure.

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According to paragraph 6, which of the following is true about the wings of birds？

All birds flap their wings constantly by using breast muscles. B. Eagles and hawks have wings that propel them at 170 km/hr. C. The airfoils of birds function like the wings on airplanes. D. Wings are attached to airfoils in the bird's skeletal structure.

姐姐想买很多漂亮衣服。 ()

From this letter we can see that______.

我现在不会用筷子。 ()

The final document was, of course, supposed to mend the damage______upon the world by the

All birds flap their wings constantly by using breast muscles.
B. Eagles and hawks have wings that propel them at 170 km/hr.
C. The airfoils of birds function like the wings on airplanes.
D. Wings are attached to airfoils in the bird's skeletal structure.