|
阅读理解训练题（二十九） （A） Wind—even the slightest of winds can prevent frost (霜冻).That’s because wind is like a spoon in your cup of tea: it stirs （搅起）things down and brings down a lot of warm air that often floats just above housetops and trees . It may seem strange , but ice itself sometimes can protect crops from frost . Some growers actually spray their crops with water on a freezing night . Water freezes quickly on plants and then a strange thing happens . As long as ice stays wet , it can’t get colder than 32癋h, a temperaure many plants can stand . By continual spraying water on the ice , the growers keep it from going below 32 degrees even if the air is much colder . This may defeat frost and saves plants . This strange kind of “ice blanket” works only on plants that are strong enough to stand the weight of frozen spray . This is used even to protect banana plants on some Central American farms . 56．If the ice became entirely frozen and dry , suppose what might happen . A．The plants might be frozen to death . B．The plants might benefit from it . C．It might save the plants . D．It might make the plants grow slowly . 57．Ice can save plants rather than destroy them on condition that they are A．sprayed regularly | 
