II. Complete the table with words:

Noun	Verb
	bias
	control
exposure
(person)	participate
	intervene
	study

III. Complete the sentences with a word from the text.

1. People who are not receiving the experimental treatment, but who are otherwise the same as those receiving it are ……………… .

2. A trial in which neither the subjects nor the researchers know who is receiving the treatment is a …………………………………. trial.

3. A study that follows the participants over many years is a ………………………study.

4. A …………………….is a group of people with similar characteristics.

5. Allocation to groups is ……………………. if all participants have equal chance of being in either group.

6. A harmless substance given to some participants to test the effect of a trial substance is a ………………………….. .

7. Something that might be a part of the cause of a disease is a …………………factor.

8. Something that might cause confusion about the cause of a disease is a ………….. variable.

IV. Find sentences with the words given above.

V. Describe a research study that you have carried out or would be interested in.

Grammar and speaking

1. Pay attention to the “use” of one in sentences:

1. One should take care of one’s health.

2. One should control the diet by limiting foods high in cholesterol.

3. It is possible to prevent pneumonia in many susceptible persons by being aware of factors that predispose one to disease and by taking precautions.

2. The word both could be used as independently “a”, “so as” in construction with “and” (как, так и …).

1. Bacteria are both useful and harmful to humans.

2. The heart is well supplied with both sympathetic and parasympathetic nerves.

3. The nose is the specialized structure of the face that serves both as the organ of smell and as a means of bringing air into the lungs.

4. The spleen is an organ of dual nature, belonging to both the blood-vascular and lymphatic system.

3. The construction “no longer” is translated as «больше не».

1. Artificial respiration is a technique to provide air to an individual whose respiratory muscles are no longer functioning.

2. Many scientists no longer see cancer as caused by a single agent but by a combination of factors.

3. Scarlet fever is no longer considered to be a very serious illness.

4. Through the skin is normally impregnable to infectious agents, this no longer holds true when the skin is broken.

4. The construction “rather than” is translated as «а не».

1. Diagnosis, rather than treatment, is usually the main focus of the activities of pathologists.

2. To homeopath, illness is seen as a sign of disharmony or imbalance in the body’s normal working, so they try to resolve underlying problem rather than simply dealing with symptoms.

3. It is from the lymph rather than from the blood that tissues receive their nourishment and into it they excrete their waste products.