شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 10228

The book is designed so skillfully that it can enable the students to … their goals in learning English better.

Protein plays a very important role in a successful health, beauty, and anti-aging program. It is the basic material of life. In fact, the word protein comes from an ancient Greek word meaning “of first importance.”

The body could not grow or function without it. As protein is digested, it breaks down into amino acids, which are then used by the cells to repair themselves. Since the human body can manufacture only 11 of the 20 amino acids that are essential for life, the remaining 9 must be provided through the intake of dietary protein.

 Without enough protein, our bodies enter into a fast aging mode. Our muscles, organs, bones, cartilage, skin, and the antibodies that protect us from disease are all made of protein. Even the enzymes that take part in essential chemical reactions in the body - from digestion to building cells - are made of protein. If your cells do not have complete access to all the essential amino acids, cellular repair will be incomplete and also much slower.

 It’s important to note that protein cannot be stored in our bodies, therefore, we need to have a good source of quality protein at each meal for optimum health and cellular repair.

What aspect of protein does the passage mainly discuss?

Passage 1:

Most human beings are awake during the day and sleep all night. Owls live the opposite way. Owls are nocturnal. This means that they sleep all day and stay awake at night. Because owls are nocturnal, this means they must eat at night. But finding food in the dark is difficult. To help them, they have special eyes and ears.

Owls have very large eyes. These eyes absorb more light than normal. Since there is little light during the night, it is helpful to be able to absorb more of it. This helps owls find food in the dark.

Owls also have very good hearing. Even when owls are in the trees, they can hear small animals moving in the grass below. This helps owls catch their prey even when it is very dark.

Like owls, mice are also nocturnal animals. Mice have an excellent sense of smell. This helps them find food in the dark. Being nocturnal helps mice to hide from the many different animals that want to eat them. Most of the birds, snakes, and lizards that like to eat mice sleep at night—except, of course, owls!

In paragraph 1, we learn that “Owls are nocturnal.” From this sentence, we can understand that a nocturnal animal … .