----- Nội dung dịch tự động từ ảnh -----
V. Read the following passage and choose the correct answer to each of the following questions. Write
your answers (A, B, C, or D) in the corresponding numbered boxes on the answer sheet.
Petroleum products, such as gasoline, kerosene, home heating oil, residual fuel oil, and lubricating oil,
come from one source - crude oil found below the earth's surface, as well as under large bodies of water,
from a few hundred feet below the surface to as deep as 25,000 feet into the earth's interior. Sometimes
crude oil is secured by drilling a hole into the earth, but more dry holes are drilled than those producing oil.
Either pressure at the source or pumping forces crude oil to the surface.
Crude oil wells flow at varying rates from about ten to thousands of barrels per hour. Petroleum products
are always measured in forty-two-gallon barrels.
Crude oil wells flow at varying rates from about ten to thousands of barrels per hour. Petroleum products
are always measured in forty-two-gallon barrels.
Petroleum products vary greatly in physical appearance: thin, thick, transparent, or opaque, but regardless,
their chemical composition is made up of only two elements: carbon and hydrogen, which form compounds
called hydro-carbons. Other chemical elements found in union with the hydrocarbons are few and are
classified as impurities. Trace elements are also found, but in such minute quantities that they are
disregarded. The combination of carbon and hydrogen forms many thousands of compounds which are
possible because of the various positions and unions of these two atoms in the hydrocarbon molecule.
The various petroleum products are refined by heating crude oil and then condensing the vapors. These
products are the so-called light oils, such as gasoline, kerosene, and distillate oil. The residue remaining
after the light oils are distilled is known as heavy or residual fuel oil and is used mostly for burning under
boilers. Additional complicated refining processes rearrange the chemical structure of the hydrocarbons to
produce other products, some of which are used to upgrade and increase the rating of various types of
gasoline.
Question 18: The word "minute" in paragraph 3 is closest in meaning to
B. large
C. tiny
A. huge
D. average
Question 19: Many thousands of hydrocarbon compounds are possible because
A. the petroleum products vary greatly in physical appearance
B. complicated refining processes rearrange the chemical structure
C. the two atoms in the molecule assume many positions
D. the pressure needed to force it to the surface causes molecular transformation
Question 20: All of the following are listed as light oils EXCEPT
A. Distillate oil
C. Gasoline
B. Lubricating oil
Question 21: What are the principal components
A. Hydrogen and carbon
C. Crude oils
D. Kerosene
of all petroleum products?
B. Residual fuel oils
D. Refined substances
Question 22: The word "they" in paragraph 3 refers to
A. impurities B. hydrocarbons
C. minute quantities D. trace elements