45
to living in water. Whales and dolphins can dive deep in the water on a single breath.
Whales and dolphins also have a 46
developed brain. They are considered to be very
47 .
Dolphins as well as some whales, can use echolocation (回声定位法) to find food and to identify objects
48
them. They make
49
clicking and squeaking sounds that bounce off (从……弹回) objects and echo (发出回声) back to the dolphin. This echo
50
the dolphin of the nearby object.
41.A. shore
B. water
C. desert
D. zoo
42.A. never
B. seldom
C. sometimes
D. some times
43.A. Babies
B. Animals
C. Fathers
D. Dolphins
44. A. fur
B. hair
C. skin
D. organ
45. A. been
B. focused
C. admitted
D. adapted
46. A. high
B. special
C. highly
D. quickly
47. A. intelligent
B. pretty
C. lazy
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