50. What is true according to this passage?
(A) Birds fly north in the winter.
(B) All animals migrate every other year.
(C) Humpback whales are very big.
(D) Whales live in the same place all their lives.

答案：登入後查看
統計： A(1), B(0), C(2), D(0), E(0) #1406478