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Soal Pilihan Ganda
The following text is for numbers 1-5!
The human body is made up of countless millions of cells. Food is needed to build up new cells and replace the worn-out cells. However, the food that we take must be changed into substances that can be carried in the blood to the places where they are needed, this process is called digestion.
The first digestive process takes place in the mouth. The food we eat is broken up into small pieces by the action of teeth, mixed with saliva, a juice secreted by glands in the mouth. Saliva contains digestive juice which moistens the food, so it can be swallowed easily.
From the mouth, food passes through the esophagus (the food passage) into the stomach. Here, the food is mixed with the juices secreted by the cells in the stomach for several hours. Then the food enters the small intestine. All the time the muscular walls of the intestine are squeezing, mixing, and moving the food onward.
In a few hours, the food changes into acids. There are soon absorbed by the villi (microscopic branch projections from the intestine walls) walls and passed into the bloodstream.
1. What is the text about?
a. The digestive system
b. The digestive juice
c. The method of the digestive system
d. The process of intestine work
e. The food substance
Answer: a
2. How can we swallow food easily?
a. The food changes into acids absorbed by the will
b. The food must be digested first through the process
c. The food is directly swallowed through the esophagus into the stomach
d. The food is mixed with the juice secreted by the cells in the stomach
e. The food we take must be changed into substances carried in the blood to the places
Answer: b
3. From the text above, we imply that….
a. a good process of the digestive system will help our body become healthier.
b. no one is concerned with the process of the digestive system for their health.
c. the digestive system is needed if we are eating food instantly.
d. everybody must conduct the processes of the digestive system well.
e. the better we digest the food we eat, the healthier we will be.
Answer: a
4. “Human body is made up of countless millions of cells.” (Paragraph 1)
The underlined phrases mean….
a. produced
b. managed
c. arranged
d. completed
e. constructed
Answer: e
5. “Here, the food is mixed with the juices secreted by the cells”.
The underlined word above has the same meaning with….
a. water
b. solid
c. rock
d. land
e. air
Answer: a
The following text is for numbers 6-10!
Acid rain is rain that is highly acidic because of sulfur oxides, nitrogen oxides, and other air pollutants dissolved in it. Normal rain is slightly acidic, with a pH of 6. Acid rain may have a pH value as low as 2.8.
Acid rain can severely damage both plant and animal life. Certain lakes, for example, have lost all fish and plant life because of acid rain.
Acid rain comes from sulfur in coal and oil. When they burn, they make sulfur dioxide (SO₂). Most sulfur leaves factory chimneys as the gaseous sulfur dioxide (SO₂) and most nitrogen oxides (NO ᴏr NO₂), both of which are gasses. The gasses may be dry deposited-absorbed directly by the land, by lakes, or by the surface vegetation.
If they are in the atmosphere for any time, the glasses will oxidize (gain an oxygen atom) and go into solution as acids. Sulfuric acid (H₂SO₄) and the nitrogen oxides will become nitric acid (HNO₃). The acids usually dissolve in cloud droplets and may travel great distances before being precipitated as acid rain.
Catalysts such as hydrogen peroxide, ozone, and ammonium help promote the formation of acid in clouds. More ammonium (NH₄) can be formed when some of the acids are partially neutralized by airborne ammonia (NH₃). Acidification increases with the number of active hydrogen (H⁺) ions dissolved in acid.
Hydrocarbons emitted by, for example, car exhaust will react in sunlight with nitrogen oxides to produce ozone. Although it is invaluable in the atmosphere, low-level ozone causes respiratory problems and also hastens the formation of acid rain. When acid rain falls on the ground it dissolves and liberates heavy metals and aluminum (Al).
