题干

下列有关腔肠动物和扁形动物的说法中,正确的是(  )


A:海葵、海蜇和水螅等动物属于生活在海水中的腔肠动物

B:海葵、海蜇与涡虫、绦虫等腔肠动物结构简单,有口无肛门

C:海葵和海蜇等动物的结构虽然简单,但却具有内胚层细胞围成的消化腔

D:海葵和珊瑚虫等动物的结构虽简单,但种类庞大,是动物界的第二大类群

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答案(点此获取答案解析)

C

同类题4

任务型阅读,请阅读下面这篇文章,根据所提供的信息,完成下面的信息卡。

    We often dine out with others, but do you know some basic etiquette (礼节)? If you behave well at the table, it will make your partners happy. But if you don't know how to behave yourself, you will feel embarrassed. Here are some tips for the table etiquette.

    When helping a woman pull her chair to the table, hold it and guide it. Don t shove(碰撞)it against the back of her legs.
     If you're seated at a table with eight or fewer guests, wait for everyone to be served and for the hostess(女主人) to begin eating before you dig in. At a long banquet table, it's OK to start when several people are seated and served.

    If you prefer not to have wine while dining out, don't turn your glass upside down, and don t make a big deal of saying you don't drink. Simply place your fingertips on the rim(边缘) of the glass and say" Not today, thanks."

    When you excuse yourself to go to the restroom, just say" Please excuse me."

    When out with friends or family—even at a fancy restaurant –it's OK to ask for your leftovers(吃剩的饭菜) to be wrapped. But don't do it at a business lunch or dinner.

Information Card

The feeling you may get if you don't behave well at the table

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The number of the guests when waiting for everyone to be served

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The reason why you place your fingertips on the rim of the glass

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The time that don't ask for your leftovers to be wrapped

____

The number of suggestions for the table etiquette

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