sheet of clear or slightly milky plastic, six feet of plastic 5 ＇＇required, though, are a 5
to catch the water. These pieces can be — perhaps just a drinking cup —tube, and a container
folded into a neat little pack and fastened on your belt.
To construct a working still, use a sharp stick or rock to dig a hole four feet across and
s three feet deep. Try to make the hole in a damp area to increase 'the water catcher productivity.
Place your cup in the deepest part of the hole. Then lay the tube in place so that one end rests
the side of the hole.
and out —all the way in the cup and the rest of the line runs up —
Next, cover the hole with the plastic sheet, securing
the edges of the plastic with dirt and ) with
圆锥体' weighting the sheet s center down with a rock. The plastic should now form a cone(
45-degree-angled sides. The low point of the sheet must be centered directly over, and no more than three inches above, the cup.
蒸the plastic. Ground water evaporates The solar still works by creating a greenhouse under (
and collects on the sheet until small drops of water form, run down the 发 )material and fall off into the cup. When the container is full, you can suck
t have to break down the the refreshment out through the tube, and won 'still every time you need a drink.
32. What do we know about the solar still equipment from the first paragraph? s expensive. s delicate. 'A. It 'B. It
s portable .
C. It ''D. It s complex.
33. in paragraph 2” What does the underlined phrase “the water catcher refer to?
B. The still. A. The tube.
C. The hole.
D. The cup. s the last step of constructing a working 34. 'What
solar still? A. Dig a hole of a certain size. B. Put the cup in place.
withhole the Cover D. s center down 'C. Weight the sheet . plastic the
sheet.
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35. When a solar still works, drops of water come into the cup form .
B. outside the hole A. the plastic tube D. beneath the sheet C. the open air 8
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第二节 ( 共 5 小题；每小题 2 分，满分 10 分 )
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