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Diseases have diverse causes, which can be classified into two broad groups: infectious and noninfectious. Infectious diseases can spread from one person to another and are caused by microscopic (极小的) organisms that invade the body. Noninfectious diseases are not communicated from person to person and do not have, or are not known to involve, infectious agents. Some diseases, such as the common cold, are acute, coming on suddenly and lasting for no more than a few weeks. Other diseases, such as arthritis (关节炎), are chronic (长期的), persisting for months or years, or recurring (复发) frequently.
Every disease has certain characteristic effects on the body. Some of these effects, called symptoms and signs, include fever, inflammation, pain, fatigue, dizziness, nausea, and rashes, and are readily apparent to the patient. These symptoms offer important clues that help physicians and other health care professionals make a diagnosis. Many times, however, the symptoms point to sever
A. fever, inflammation, pain, fatigue, dizziness, arthritis and rashes
B. fever, inflammation, pain, fatigue, dizziness, nausea, and rashes
C. fever, inflammation, fatigue, dizziness, nausea, arthritis and rashes
D. fever, inflammation, chicken pox, fatigue, dizziness, nausea, and rashes

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[单项选择]Diseases have diverse causes, which can be classified into two broad groups: infectious and noninfectious. Infectious diseases can spread from one person to another and are caused by microscopic (极小的) organisms that invade the body. Noninfectious diseases are not communicated from person to person and do not have, or are not known to involve, infectious agents. Some diseases, such as the common cold, are acute, coming on suddenly and lasting for no more than a few weeks. Other diseases, such as arthritis (关节炎), are chronic (长期的), persisting for months or years, or recurring (复发) frequently.
Every disease has certain characteristic effects on the body. Some of these effects, called symptoms and signs, include fever, inflammation, pain, fatigue, dizziness, nausea, and rashes, and are readily apparent to the patient. These symptoms offer important clues that help physicians and other health care professionals make a diagnosis. Many times, however, the symptoms point to several possib
A. The classification of diseases.
B. The causes of diseases.
C. The diverse diseases.
D. The diseases’ classification and causes.

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Diseases have diverse causes, which can be classified into two broad groups: infectious and noninfectious. Infectious diseases can spread from one person to another and are caused by microscopic (极小的) organisms that invade the body. Noninfectious diseases are not communicated from person to person and do not have, or are not known to involve, infectious agents. Some diseases, such as the common cold, are acute, coming on suddenly and lasting for no more than a few weeks. Other diseases, such as arthritis (关节炎), are chronic (长期的), persisting for months or years, or recurring (复发) frequently.
Every disease has certain characteristic effects on the body. Some of these effects, called symptoms and signs, include fever, inflammation, pain, fatigue, dizziness, nausea, and rashes, and are readily apparent to the patient. These symptoms offer important clues that help physicians and other health care professionals make a diagnosis. Many times, h
A. fever, inflammation, pain, fatigue, dizziness, arthritis and rashes
B. fever, inflammation, pain, fatigue, dizziness, nausea, and rashes
C. fever, inflammation, fatigue, dizziness, nausea, arthritis and rashes
D. fever, inflammation, chicken pox, fatigue, dizziness, nausea, and rashes

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[填空题]Causes of depression can be divided into two categories, internal factors and external ones.

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[单项选择]Rocks which have solidified directly from
molten materials are called igneous rocks.
Igneous rocks are commonly referred to as
Line primary rocks because they are the original
(5) source of material found in sedimentaries and
metamorphics. Igneous rocks compose the greater
part of the earth’s crust, but they are generally
covered at the surface by a relatively thin layer of
sedimentary or metamorphic rocks. Igneous rocks
(10) are distinguished by the following characteristics:
(1) they contain no fossils; (2) they have no regu-
lar arrangement of layers; and (3) they are nearly
always made up of crystals.
Sedimentary rocks are composed largely of
(15) minute fragments derived from the disintegration
of existing rocks and in some instances from the
remains of animals. As sediments are transported,
individual fragments
A. Ⅰ only
B. Ⅲ only
C. Ⅰ and Ⅱ only
D. Ⅱ and Ⅲ only
E. (E) Ⅰ, Ⅱ, and Ⅲ

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