The author states that during dream sleep, the animal sleeps
A、without moving
B、shallowly
C、intermittently
D、on its side
Task 221. In most cases of cloud-to-ground lightning, the ground'ssurface__________22. One form of lightning that is ball lightning. __________23. Cloud lightning looks like a ribbon when its lighting channel__________24. Although not fully understanding processes of lightning, man__________25. Lightening can__________A. occurs most infrequentlyB. is shifted sideways by strong windsC. strike twice or more in the same spotD. is equipped with a good knowledge of various forms oflightningE. is estimated at 20 million a yearF. is positively charged
下面的短文有10处空白，短文后列出12个词，其中10个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。SupermarketMost 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(足够的) 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 is37 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____, whopays the total, collects the bag and leaves.
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