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题型：单选题题类：真题难易度：普通

When you see the sign _____ in public, you must keep quiet.

A、

B、

C、

举一反三

What is a machine that is used to cool the air in a room by moving it around?

Opposite my house is______. My ten-year-old son often goes there with his classmates on Saturday.

Mary likes eating vegetables, such as potatoes, tomatoes and _________.

找出下列各组单词中不同类的一项

—Can you tell me who i{#blank#}1{#/blank#} the first air conditioner?

—Willis Haviland Carrier.

英语字母共有____个，其中元音字母有____个。

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