Compared with dreamless sleep, deep dream sleep is

• A、not the result of natural selection
  
  

• B、less likely to appear to monkeys
  
  

• C、more protective to the animals
  
  

• D、at a higher stage of evolution
  
  

The author suggests that, because there are no hiding places in the oceans, whales and dolphins

• A、 sleep only when they are very young
  
  

• B、 cannot afford to sleep very much
  
  

• C、usually dream while awake
  
  

• D、take turns to sleep
  
  

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Supermarket

Most supermarkets need a very large floor area, sometimes at least ten times as big as that of an ordinary shop. There are usually two doors, one as an entrance and the other as an     31   . The rest of the side facing the street is largely of plate glass, with goods or advertising material displayed. The other three walls are     32    decorated in light colors, giving an     33   of cleanliness and brightness.

At right angles to the window stretch long structures about six feet  ___34____ with a number of shelves on each side. Similar shelf units or frozen food containers extend round the walls. Broad aisles (通道) between the shelf units and ample (足夠的) space between them and the window and also the far wall     35    room for the circulation of many people.    36   commodities (商品) , in tins,  bags, boxes or other containers, are stacked (堆放) in groups on the shelves, and each group is   37   with a price ticket. Metal baskets near the entrance are taken by the shoppers who collect the goods that they  ___38____ from the shelves.

Between the shelf units and the windows are a number of small corners about three feet high. Beside each  ___39____ a cashier, who operates a machine for the totaling cost of each customer's purchases. The customer places the basket at one end of the counter so that it can be emptied by the cashier who records the price of the commodities one by one, before putting each on a moving section of the counter top. The cashier finally hands a printed slip recording all prices to the  ___40____, who pays the total, collects the bag and leaves.

A. sits	B. high	C. exit
D. customer	E. various	F. small
G. tall	H. normally	I. allow
J. impression	K. labeled	L. select