شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 14576

I wonder why some people decide to donate their … after death to help the lives of others while it doesn’t work most of the time.

When the sun shines, a leaf becomes a food factory. Sunlight comes into a leaf through the leaf’s skin, which is clear like glass. Beneath the skin are millions of tiny ‘bags’ called cells. Inside the cells are small packages filled with a green stuff called chlorophyll. The chlorophyll catches sunlight.

Air comes into the leaf through many tiny openings. Water and minerals, moving up from the roots far below; flow through the leaf. The air and water mix together and flow into the cells.

Green chlorophyll, using sunlight for energy, changes water and a gas from the air (called carbon dioxide) into sugar. Some of this sugar is used by the plant as food. Some is mixed with minerals from the ground and changed into other kinds of food.

The passage says that leaves have a skin that … .

The best title for the passage could be “…”.

The dog was in his … whenever his owner took him to the dog park.

From the passage, it is understood that … .