Read the text below and choose the correct word for each space. For each question, circle letter A, B, C or D next to the answer you choose. Dolphins communicate mainly by (46)________ of sounds. These sounds not only (47)________ whistles, but also so-called pulsed sounds, which are often described as squawks, barks, rasps, etc. However, they also use breaching (jumping and falling back into the (48)________ with a loud splash) and pectoral fin (or flipper) and tail (or fluke) slaps (hitting ...

Read the text below and choose the correct word for each space. For each question, circle letter A, B, C or D next to the answer you choose.

Dolphins communicate mainly by (46)________ of sounds. These sounds not only (47)________ whistles, but also so-called pulsed sounds, which are often described as squawks, barks, rasps, etc. However, they also use breaching (jumping and falling back into the (48)________ with a loud splash) and pectoral fin (or flipper) and tail (or fluke) slaps (hitting the flipper or fluke on the water surface). Body posturing and jaw popping also have a role in (49)________. As for language, we do not know (50)________ they have one. Several studies have demonstrated that dolphins can understand a structured language like (51)________. This has been demonstrated for a number of other animal species as well (gorilla, California sea lion, and parrot). Some studies also indicate that dolphin vocalizations are complex (52)________ to support some form of language. (53)________, it has not been demonstrated (54)________ that they can undoubtedly communicate (55)________ themselves.

Dolphins communicate mainly by (46)________ of sounds.