听下面一段独白，回答以下小题。
1.
2.
3.
1.
| A．Because they have true blue eyes. |
| B．Because they look true blue underwater. |
| C．Because they have true blue underbellies. |
| D．Because they look true blue on the surface. |
| A．By giving out yellowish light. |
| B．By changing the color of their backs. |
| C．By emitting a series of pulses and sounds. |
| D．By traveling through the ocean at 20 miles an hour. |
| A．When they are angry, they let out the loudest noise. |
| B．They are highly intelligent animals without social life. |
| C．An ordinary-sized whale weighs as much as an elephant. |
| D．They rely on excellent hearing to communicate and navigate. |
更新时间：2021-11-02 09:08:58
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