A. STOPPING B. ANNOYING C. DISTURBING D. BREAKINGTASK 2

80. A. stopping B. annoying C. disturbing D. breaking

Task 2: READING COMPREHENSION

Read the passage and choose the best answer for each question below.

A balanced diet contains proteins, which are composed of complex amino acids. There are 20

types of amino acids, comprising about 16 percent of the body weight in a lean individual. A body

needs all 20 to be healthy. Amino acids can be divided into two groups: essential and nonessential.

There are 9 essential amino acids. These are the proteins that the body cannot produce by itself, so a

healthy individual must ingest them. The 11 nonessential amino acids, on the other hand, are

produced by the body, so it is not necessary to ingest them. Proteins are described as being either

high-quality or low-quality, depending on how many of the 9 essential amino acids the food

contains. High-quality proteins, typically found in animal meats, are proteins that have ample

amounts of the essential amino acids. Low-quality proteins are mainly plant proteins and usually

lack one or more of the essential amino acids. Since people who follow a strict vegetarian diet are

ingesting only low-quality proteins, they must make sure that their diets contain a variety of

proteins, in order to ensure that what is lacking in one food is available in another. This process of

selecting a variety of the essential proteins is called protein complementation. Since an insufficient

amount of protein in the diet can be crippling, and prolonged absence of proteins can cause death,

it is imperative that a vegetarian diet contains an ample amount of the essential proteins.