36．A．in                 B．at                   C．like                 D．for

35．A．tire               B．tired                 C．tiring                D．is tired

34．A．whether            B．if                  C．and                 D．but

33．A．dog                B．doctor                C．student               D．patient

32．A．before             B．in                         C．ago                 D．after

31．A．with               B．at                   C．on                  D．in

30．--Why do you prefer lemons to orange?

--Because they taste         ．

A．sweet                B．sour                C．salty               D．hot

根据短文内容，从各题所给的A、B、C、D四个选项中选出最佳选项。

No．1 Hospital is in the middle of the town．All the doctors are busy   31   their work every day．A few days   32   a new   33   began to work in this hospital．She is very clever,  34   she never speaks．She can work all the day and never gets   35  , she is one metre tall and has a face   36   a TV screen．She is Dr．Robot．

Doctors often need to ask their   37   a lot of questions．  38   doctors can only spend a few minutes on a patient（病人）．But Dr．Robot can ask a patient   39   an hour if it's  40 ．

__41   the help of Dr．Robot, a human doctor can   42   a lot of useful information when he meets his patient．

How can Dr. Robot do it? A computer in it "tells" her   43   to do．Dr. Robot can do a lot of things people can do, though she can't completely（完全地）  44   the place of    45  doctors．

29．--Who          shoes with adjustable heels invented         ?

--Jayce Coziar and Jamie Ellsworth．

A．was, by               B．were, for            C．were, by             D．was, for

28．--How long did you spend          the classroom?

--Half an hour．

A．cleaning              B．cleaned             C．to clean            D．cleans

27．--Why are you so sad?

--Because I          my backpack in the classroom and I can't do my homework．

A．have forgotten        B．have left              C．leave               D．forget