2错误-欲抑先扬：Good guess, but…
-委婉语气：well, umm, actually…
-Why is it wrong?
-What is right?
According to the professor, what is the common reason for migration that does not apply to baleen whales?
A They need to avoid lower water temperatures
B They need to raise young in a suitable environment.
C They need to find better feeding grounds.
D They need to find a mating partner
In order to prove or disprove the balancing-act theory of whale migration, what question needs to be answered?
A Whether or not whales have good eyesight.
B How long baleen whales are able to survive without food.
C How fast baleen whales can swim compared with other kinds of whales.
D Whether moving south saves whales more energy than staying north.