The wings of a bird function as a(n)( ).
A: parachute
B: lever/pulley system
C: airfoil
D: canopy
E: hydrofoil
A: parachute
B: lever/pulley system
C: airfoil
D: canopy
E: hydrofoil
举一反三
- The bird （）its wings and flew to the south. A: beat B: hit C: strike D: struck
- The bird flapped its wings and flew away.. A: control B: flew C: symbolize D: beat
- They saw the bird flap its wings and ________ away. A: fly B: flied C: flew D: flying
- Which is true? A: Bat wings evolved from bird wings B: Ears evolved from jaws C: Insects evolved from crustaceans D: Limbs evolved from fins
- A moth possesses two pairs of wings _____ as single pair and are covered with dustlike scales. A: function B: are functioning C: that function D: but functions