单选题Grandpa（）to water the flowers now, It’s going to rain soon.A isn’t needingB needn’tC doesn’t needD needs
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问答题Water is vital for our survival and for producing food. It takes about a thousand tons of water to produce one tone of grain that, fed to cows, produces only 18 pounds of meat. Today mankind is using about 160 billion tons more water each year than is being replenished by rain and fed back into water storages. If this water were carried in water trucks, it would require a 300, 000-mile-long convoy of trucks every day—a convoy length 37 times the diameter of the Earth. This is how much water we are using and not replenishing.
单选题The first indications a mariner will have of the approach of a warm front will be （）.A large cumulonimbus (thunderclouds) building upB high cirrus clouds gradually changing to cirrostratus and then to altostratusC fog caused by the warm air passing over the cooler waterD low dark clouds accompanied by intermittent rain
单选题Early indications of the approach of a hurricane may be all of the following EXCEPT（）.A short confused swellsB gradually increasing white clouds (mare's tails)C pumping barometerD continuous fine mist-like rain
填空题The Sun has a huge effect on our water.____
单选题Which statement concerning the collection of fresh water is FALSE?（）A Fresh water may be obtained from fishB Lifeboat covers or canopies should be washed with rain before drinking water is collectedC Fresh water may be collected from condensation inside the liferaftD Seawater should never be consumed
单选题A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.A occluded frontB stationary frontC warm frontD cold front
