Прочитайте текст и определите какой из заголовков соответствует тексту In a gas atom like hydrogen w...: ответ на тест 90055 - Английский язык

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In a gas atom like hydrogen, when the vibration increases the heat makes the atom expand more and lose its electron. The hydrogen atom becomes two separate charged particles: proton (+) and electron (−). Each of these particles is called plasma – a positive plasma and a negative plasma.
Plasma is not only produced by heat but also by particles bombarding the atoms. We can find plasma produced by heat in the sun, and plasma produced by particles bombarding the atoms in the ionosphere. We can also find artificial plasma during electric welding and inside fluorescent lamps.
Interstellar space, the stars, and most of the universe is plasma. our planet is a tiny mass in a sea of plasma.

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Plasma Cutters
1. Modern industry depends on the manipulation of heavy metal and alloys. We need metals to build the tools and transportation necessary for day-to-day business. The reason is simple: metals are extremely strong and durable, so they're the logical choice for most things that need to be especially big, especially sturdy, or both.
2. The funny thing is that metal's strength is also a weakness: because metal is so good at resisting damage, it's very difficult to manipulate and form into specialized pieces. People can precisely cut and manipulate the metals using the plasma cutter. The plasma cutter is actually a common tool that has been around since World War II.
3. Plasma cutters are not the only devices to harness the power of plasma. Neon signs, fluorescent lighting and plasma displays, just to name a few, all rely on it to get the job done. These devices use "cool" plasma. Though cool plasma cannot be used to cut metals, it has tons of other useful applications.
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How is the effectiveness of plasma used in industry?

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A newborn baby has no immunity to whooping cough at all, and so he must be kept protected from children who have any kind of cough. Whooping cough seems like an ordinary cough for the first few days, but gradually the bouts become more and more prolonged and the child coughs continuously. His face becomes red and he very often vomits. At the end of the bout of cough, when he takes a deep breath, a croaky sound is heard which is called the whoop and which gives the disease its name. The disease is a prolonged one and the cough may last 2–3 months. It can lead to lung complications also.
The child loses weight because of repeated vomiting. Fortunately, it can be prevented by immunizing the child with triple antigen (DPT) injections.
A child with whooping cough should be kept separate from other children for the first 3–4 weeks. The disease is more severe in babies under 1 year of age, and every effort must be made to isolate them, at least.
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The disease is a prolonged one and the cough may last …

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Solid
1. Solid is one of the major states of matter. It is characterized by structural rigidity and resistance to changes of shape or volume. Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire volume available to it like a gas does. The atoms in a solid are tightly bound to each other, either in a regular geometric lattice or irregularly one.
2. The branch of physics that deals with solids is called solid-state physics, and is the main branch of condensed matter physics (which also includes liquids). Materials science is primarily concerned with the physical and chemical properties of solids. Solid-state chemistry is especially concerned with the synthesis of novel materials, as well as the science of identification and chemical composition.
3. The forces between the atoms in a solid can take a variety of forms. For example, a crystal of sodium chloride (common salt) is made up of ionic sodium and chlorine, which are held together by ionic bonds. In diamond or silicon, the atoms share electrons and form covalent bonds. In metals, electrons are shared in metallic bonding. Some solids, particularly most organic compounds, are held together with van der Waals forces resulting from the polarization of the electronic charge cloud on each molecule. The dissimilarities between the types of a solid result from the differences between their bonding.
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1. John said that he _____ good progress in English the following year.
2. John said that he _____ good progress in English the year before.
3. John says that he _____ good progress in English next year.
4. John said that he _____ good progress in English every year.