题目内容

The receptionist offers the visitor ...

A. a glass of water
B. a cup of coffee
C. a cup of tea

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The first thing the visitor says to Mr Lessing is...

Are you Mr Lessing?
B. You must be Mr Lessing.
C. Who are you?

Stella is Mr Lessing's ...

A. friend
B. colleague
C. boss

The three will go to ...

A. a restaurant
B. the canteen
C. Mr Lessing's office

PLC的结构形式可以分为（）和（）两种。