Прочитайте текст и определите какой из заголовков соответствует тексту. Airships are huge balloons w...: ответ на тест 911701 - Английский язык

Прочитайте текст и определите, какой из заголовков соответствует тексту.
Airships are huge balloons with propellers to drive them, and they were once used to carry as many as 200 passengers.
The airships were filled with hydrogen, a light gas. However, hydrogen is also inflammable. There were several disasters in which airships caught fire, and they disappeared by the end of the 1930s.
However, airships are now flying again, but they are not common. They are lifted by helium gas, which does not catch fire.

Airships are huge balloons with propellers to drive them, and they were once used to carry as many as 200 passengers.
The airships were filled with hydrogen, a light gas. However, hydrogen is also inflammable. There were several disasters in which airships caught fire, and they disappeared by the end of the 1930s.
However, airships are now flying again, but they are not common. They are lifted by helium gas, which does not catch fire.
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There are uncountable combinations of atoms. For example, 4 carbon atoms combine with 10 1_______ atoms to make up a butane molecule. A glucose molecule is made from 6 carbon atoms, 12 hydrogen atoms and 6 oxygen 2_______. Cellulose, the principal molecule in the plant cell walls and also in wood, paper, 3_______, and many other materials, is a chain that can include up to 12,000 glucose molecules. A sugar molecule is made from carbon, hydrogen and oxygen atoms grouped in specific positions. When these same atoms are grouped in different positions they can form alcohol or starch. The different proportions and positions of the atoms produce the 4_______ forms of matter.

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Scientists have recently come to believe that 1_______ in solutions and liquid mixtures behave very much as they behave in gases, 2_______, and solids. For instance, when two substances, such as sugar and water, are combined by dissolving, the particles of the solvent divide the particles of the solute, and the two kinds of particles then 3_______ freely. This is a 4_______ solution.

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What is a crystal? A crystal is a 1_______ solid made by a natural process. Many substances absorb water from solutions when they crystallize; that is, they unite chemically with a definite proportion of 2_______. The water with which any substance unites during the process of crystallization is called the water of crystallization.
Certain 3_______ substances, for example, washing soda, give up their water of crystallization when they are exposed air; they are then reduced to 4_______. Substances that have this property are called efflorescent, and the process is called efflorescence.

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The story of the 1_______ of electricity is connected with the name of Thales, the Greek philosopher. The story goes that one day Thales rubbed a piece of amber against his sleeve and found to his great surprise that it 2_______ small bits of dried leaves. After further experimenting he concluded that this attractive 3_______ was a property that amber alone possessed. He called this characteristic “electricity” because the Greek word for amber was 4_______.