Now, airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash. According to KLM，one of Europe's biggest airlines, airplanes cannot go under the cloud or over it. Going through the cloud can result in ash getting stuck in the airplane's engines, causing damage to the plane.

　　The eruption has also caused problems for animals in Iceland. The volcano left ash and sharp glass­like rocks all over the countryside. Farmers are keeping their animals inside to stop them from eating ash­covered grass or the sharp object.

　　16．What makes Grimsvom different from other volcanoes?

　　A．It is below ice.

　　B．It lies under the sea.

　　C．It is the largest volcano.

　　D．Its lava affects the airlines.

　　17．What keeps Grimsvom still?

　　A．The slow flow of water.

　　B．The low water temperature.

　　C．The thick glacier.

　　D．The water pressure.

　　18．Which of the following is the result of the volcanic eruption?

　　A．People stop traveling in Europe.

　　B．Airlines suffer from the loss of planes.

　　C．It becomes dangerous for animals to eat outside.

　　D．Farmers have lost many of their animals.

　　19．This text is most probably taken from________.

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