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[单项选择]The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences in their resistance. The tubercle bacillus is one of the more resistant, and vibrio cholera is one of the more sensitive to drying. In general, the encapsulated organisms are more resistant than the non-encapsulated forms. Spores are quite resistant to drying; the spores of the anthrax bacillus, for example, will germinate after remaining in a dry condition for ten years or more. The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection, for the length of time that a droplet remains infective is a result, primarily, of the resistance of the particular microorganism to drying.
Tuberculosis is highly infectious because ______.
A. spores are resistant to drying
B. the causative organism is encapsulated.
C. droplets of sputum remain infective for a long time due to the resistance of the organisms to drying.
D. none of thes
[单项选择]
Passage Two
| The vegetative forms of most bacteria
are killed by drying in air, although the different species exhibit pronounced
differences in their resistance. The tubercle bacillus is one of the more
resistant, and vibrio cholera is one of the more sensitive to drying. In
general, the encapsulated organisms are more resistant than the non-encapsulated
forms. Spores are quite resistant to drying; the spores of the anthrax bacillus,
for example, will germinate after remaining in a dry condition for ten years or
more. The resistance of the pathogenic forms causing disease of the upper
respiratory tract is of particular interest in connection with airborne
infection, for the length of time that a droplet remains infective is a result,
primarily, of the resistance of the particular microorganism to
drying. |
Tuberculo
A. spores are resistant to drying
B. the causative organism is encapsulated.
C. droplets of sputum remain infective for a long time due to the resistance of the organisms to drying.
D. none of these.
[单项选择]Music comes in many forms; most countries have style of their own. (62) the turn of the century when jazz was born, America had no prominent (63) of its own. No one knows exactly when jazz was (64) , or by whom. But it began to be (65) in the early 1900s. Jazz is America’ s contribution to (66) music. In contrast to classic music, which (67) formal European traditions, jazz is spontaneous and free-form. It bubbles with energy, (68) the moods, interests, and emotions of the people. In the 1920s jazz (69) like America. And (70) it does today.
The (71) of this music are as interesting as the music (72) . American Negroes, or blacks, as they are called today, were the jazz (73) . They were brought to the Southern states (74) slaves. They were sold to plantation owners and forced to work long (75) . When a Negro died his friends and relatives (76) a process
