When the food arrives at the entrance to the stomach, it passes through a sphincterlike valve called ________________.

单选题

Akira Nakayama ____delay the filming of his documentary in the rainforest when his equipment did not arrive on schedule.

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单选题

When the food mass descends into the oropharyngeal canal, the ________ will cover the larynx, which prevent the food from entering trachea.

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单选题

The _____________ is a flap of tissue that prevents food from entering the lungs when swallowing.

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单选题

When the food arrives at the entrance to the stomach, it passes through a sphincterlike valve called ________________.

答案解析

单选题

The government ()do something about these companies especially when food safety is concerned.

答案解析