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A.to pump off
B.being pumped
C.pumping out
D.it pumping out
Only when ________with water can this liquid be used to clean wounds.
A．purified
B．devised
C．diluted
D．vaporized
A.water
B.painkillers
C.cold water
D.ice
听力原文： It seems so natural to put up an umbrella to keep the water off when it rains. But actually the umbrella was not invented as protection against rain, its first use was as a shade against the sun.
Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the first to use it were the Chinese, way back in the eleventh century B. C. We know that the umbrella was used in ancient Egypt and Babylon as a sun shade. And there was a strange thing connected with its use: It becomes a symbol of honor and authority. In the Far East in ancient times, the umbrella was allowed to be used only by royalty or by those in high office.
In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common use in ancient Greece. But it is believed that the first persons in Europe to use the umbrella as a protection against the rain were the ancient Romans.
During the Middle Age, the use of umbrella practically disappeared. Then it appeared again in Italy in the late sixteenth century. And again it was considered as a symbol of the power and authority. By 1680, the umbrella appeared in France, and later on in England.
By the eighteenth century, the umbrella was used against rain throughout most of Europe. Umbrellas have not changed much in style. during all the time, though they have become much lighter in weight. It wasn't until the twentieth century that women's umbrellas began to be made, in a whole variety of colors.
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A．In ancient China.
B．In ancient Egypt.
C．In ancient Greece.
D．In ancient Rome.
In heavily populated agricultural areas, ______ when crops fail.
A．everybody takes to water sports
B．the people starve
C．a shortage of water will help
D．more energy will be used
When the mixture is used, it is important to______.
A．keep sugar and salt in water
B．drink it as often as necessary
C．take it as much as possible
D．use it to kill the bacteria
When collecting condensation for drinking water，______．
A.A sponge used to mop up and store condensation must be kept salt free
B.Only condensation on the bottom of the canopy should be collected
C.It should be strained through a finely woven cloth
D.Chlorine tablets should be used to make it drinkable
A.Depth of the water
B.Character of the holding ground
C.maintenance cost for the chain
D.Type of anchor cable
When traveling in another country, many Americans bring water with them because ______.
A．they are not used to drinking local water
B．they assume that local water is not safe
C．they are more prone to water-borne diseases
D．their can easily fall ill if contacting with local germs
A.charted depth of water only
B.depth of water, including tidal differences
C.time and date of anchoring
D.type of anchor being used
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