oud sounds. Male giraffes often use their seeks to greet each\rother. Theil· necks can reach up to two meters. When two giraffes meet, they may "shake"\rtheir necks and rub them against each other. This is to feel how sa·ong and tall the other is.\rDolphins greet one another with whistles. They can hear other dolphins仕om many\rkilometers away. Every dolphin has a different whistle. It tells information about the dolphin,\rsuch as its age and health. When two gi·oups of dolphins meet, they each choose a member to\r"talk" to the other group. The two groups can then join up and travel together.\r16. no surprise 17. communicate through 18. two mea·es/meters\r19. one another 20. tells information .\r九年级数学试题第 1] 页
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