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单项选择题How did the nineteenth-century defenders of photography stress the photography

A．They stressed photography was a means of making people happy.
B．It was art for recording the world.
C．It was a device for observing the world impartially.
D．It was an art comparable to painting.

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单项选择题Which of the following statements about human alveolar macrophage is TRUE

A．Airborne dust may trigger suppressor macrophage suicides.
B．Airborne dust may trigger stimulatory macrophage suicides.
C．The ratio of suppressor macrophages to stimulatory ones in people with lung diseases is much higher than that in people with healthy lungs.
D．Only stimulatory macrophages show responses to airborne dust.

单项选择题According to the author, basic computer skills should be ______.

A．included as an auxiliary course in schools
B．highlighted in acquisition of professional qualifications
C．mastered through a life-long course
D．usually emphasized by any school

单项选择题The enclosures of the 17th and 18th centuries meant that

A．people had to do the productive work at home
B．people were forced to look elsewhere for means of supporting themselves
C．people were able to be dependent on their land
D．people were badly paid for the work they managed to find