单项选择题

Questions 11-13 are based on the following passage about a science project. You now have 15 seconds to read the questions 11-13. What can be used to help researchers study the sea animals’ movements

A．Loud speaker.
B．Trumpet.
C．Radio transmitters.
D．Thermometer.

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单项选择题

单项选择题

Questions 11-13 are based on the following passage about a science project. You now have 15 seconds to read the questions 11-13. What can be used to help researchers study the sea animals’ movements 您的浏览器不支持 audio 元素。