___________ is an inflammation of the lining of your bronchial tubes, which carry air to and from your lungs.

单选题

It is in the ___________ that filtration occurs.

答案解析

单选题

Everyone in the class is expected to ___________ actively in these group discussions.

答案解析

单选题

The largest salivary gland which is located in front of the ear is the ___________ gland.

答案解析

单选题

Starch is digested in two steps. First, an enzyme in the saliva and ___________ juice breaks the starch into molecules called maltose. Then an enzyme in the lining of the small intestine splits the maltose into glucose molecules that can be absorbed into the blood.

答案解析

判断题

Tipping is an accepted common practice in China.

答案解析