Are Gina’s ? A. this, books B. those, bo

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问题:

Are        Gina’s           ?

A. this, books   B. those, book   C. those, books

考点:主谓一致
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三翻四抖

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补全对话。

A:  __1__ your favourite food?

B:  My favourite food is candy.

A:  __2__  it __3__ food?

B: __4__ ,  it isn't.  It is __5__ food.

A:  What's your favourite __6__ ?

B:  My favourite drink is juice.

A:  That's good.  It is a __7__ drink.

B:  Yes.  It is good for our health.

A: __8__  you __9__ __10__ juice here?

B:  Sorry,  I haven't got any juice here.

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摩擦表面间没有润滑剂的配合件相互运动时,周围的介质对摩擦表面作用,将造成摩擦表面更大的()。

A.损伤

B.腐蚀

C.摩擦

D.磨损

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简述袋式收尘器滤袋堵塞的原因及处理方法?

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含维生素A原相对较高的是

A.菠菜

B.卷心菜

C.豌豆

D.土豆

E.苹果

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