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Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
What might be the obstacles for transmitting antenna and receiver antenna to get connected

A．Deep oceans
B．High mountains.
C．Long rivers.
D．Huts.

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The absorbable calcium found in one cup of cow’s milk equals ______ of instant oats.

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Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. What might be the obstacles for transmitting antenna and receiver antenna to get connected 您的浏览器不支持 audio 元素。