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1. Find the modal verbs and their equivalents in the text and define their meaning:

a) ability, b) possibility, c) permission or d) hypothetical possibility.

2. Write down special questions to the sentences from the text with the Modal Verbs using their equivalents.

3. Find all -ed verb forms in the text. Define their functions.

12. What Elements and Chemical Compounds are the Most Poisonous?

nutritional

харчовий

within

у межах

truly

насправді

susceptibility

сприйнятливість

exposure

піддавання

yet

проте, однак

to excrete

виділяти

otherwise

в іншому випадку

toxicity

отруйність

man-made

штучний

deadly

смертельно небезпечний

to encounter

зустрітися, стикатися

Have you ever wondered which elements are toxic? Everything is toxic if the dose is high enough. This is a short list of elements that have no nutritional value, even in trace amounts. Some of these elements accumulate in the body, so there is no truly safe exposure limit for those elements (e.g., lead, mercury). Barium and aluminum are examples of elements which can be excreted, at least to a certain extent. Most of these elements are metals. The man-made elements are radioactive and toxic whether they are metals or not: Aluminum, Antimony, Arsenic (metalloid), Barium, Beryllium, Cadmium, Lead, Mercury, Osmium and others. Radioactive metals: Polonium (metalloid), Thorium, Radium, Uranium, Transuranium elements (e.g., polonium, americium), Radioactive isotopes of metals that might not otherwise be highly toxic (e.g., cobalt  60, strontium  90).

When you get right down to what the most poisonous chemical compound is, we may say that everything is poisonous. Water will kill you if you drink too much of it. Oxygen is a deadly poison, yet we need it to live. However, there are some chemicals that we are better off not encountering. Here’s a list of the most poisonous chemicals known. Keep in mind, toxicity varies from one species to another (i.e., what may be poisonous for a mouse may be more / less poisonous to a human) and within a species (i.e., age, sex, genetics all affect susceptibility to a toxin). Here are some names of the toxins, their source, approximate average lethal dose per kilogram of body weight (LD50), and the species: tetanus  1 nanogram/kg  mouse, human; botulinal neurotoxin (bacteria)  1 nanogram/kg  mouse, human; shigella (bacteria)  1 nanogram/kg  monkey, human; palytoxin (coral)  60 nanogram/kg – dog and others.

Speech patterns

to a certain extent

до певної міри

Barium and aluminum are examples of elements which can be excreted, at least to a certain extent.

Барій і алюміній є прикладами елементів, які можливо виділити, принаймні в певній мірі.

to bear (to keep) in mind

пам’ятати, мати на увазі

Bear (keep) that in mind!

Запам’ятайте! Майте це на увазі!

1. Match the definitions and the corresponding terms:

a) the property that some elements or isotopes have of spontaneously emitting energetic particles by the disintegration of their atomic nuclei

1) a toxin

b) the processes by which an individual takes in and utilizes food material

2) nutrition

c) a group of objects or individuals, all sharing at least one common attribute, that forms a subdivision of a genus

3) man-made

d) made by humans rather than nature

4) a species

e) a poisonous substance produced by metabolic activities of a living organism that is usually unstable, very toxic when introduced into the tissues, and usually capable of inducing antibodies

5) radioactivity

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