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Communications technology was used on ocean expedition at the launching of Ronald H. Brown.

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N
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The images taken by the robots in the deep sea can be transmitted straight to receivers at the University of Rhode Island.
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The example of dogs and cats in the second paragraph is intended to _______.
A．explain which animals are mammals
B．show the differences between mammals
C．illustrate how shallow dreamless sleep is
D．reveal how smart they are
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