24. What does this trick mean in the reading?
(A) Having eggs of different sizes.
(B) Growing stronger inside the egg.
(C) Saving food for weaker baby birds.
(D) Helping baby birds break out of the eggs.
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統計: A(643), B(133), C(78), D(60), E(0) #1996784
統計: A(643), B(133), C(78), D(60), E(0) #1996784