SALLY MUST HAVE CALLED HER SISTER LAST NIGHT, BUT SHE ARRIVED HO...

10. Sally must have called her sister last night, but she arrived home too late to call her.

A B C D

PART THREE: READING

I. Read the passage below and choose the correct answer for each question.

Write your answers A, B, C or D on your answer sheet. (5 pts)

Petroleum products, such as gasoline, kerosine, home heating oil, residual fuel oil, and lubricating oils, 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 through the earth, but more dry

holes are drilled than those producing oil. Pressure at the source or pumping forces crude oil to the surface.

Crude oil wells flow at varying rates, from 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 hydrocarbons. Other chemical

elements found in union with the hydrocarbons are few and are classified as impurities. Trace elements are also found, but these are

of 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 joinings of these two atoms in the hydrocarbon molecule.

The various petroleum products are refined from the crude oil by heating and condensing the vapors. These products are

the so-called light oils, such as gasoline, kerosine, 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 octane rating

of various types of gasolines.