皮皮学，免费搜题
登录
搜题
【单选题】
According to the paragraph 4, which of the following is true of cilia?A.
Cilia are tiny extensions of membranes that normally provide help in clearing the membranes.
B.
The term 'cilia' refers to the hair lining of membranes that prevent foreign matter from entering our body.
C.
The tiny projections in the lining membranes are known as cilia and they block incoming foreign matters.
D.
Cilia are part of the lining membranes of the mouth and throat, and they help preventing external particles from entering our body.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】表达式语句由( )+( )构成;表达式由( )和( )组成。
【简答题】给下面文段断句,并翻译成现代汉语。 当是时楚兵冠诸侯诸侯军救钜鹿下者十馀壁莫敢纵兵及楚击秦诸将皆 从壁上观 楚战士无不 一以当十 楚兵呼声动天诸侯军无不人人惴恐於是已破秦军项羽召见诸侯将入辕门无不膝行而前莫敢仰视项羽由是始为诸侯上将军诸侯皆属焉
【简答题】表达式语句由一个表达式和一个_________构成。