单项选择题

The discovery of the halftone process in photography in 1881 made it ______ photographs in books and newspapers.

A. the possible reproduction
B. possible to reproduce
C. the possibility of reproducing
D. possibly reproduced
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单项选择题
The mining industry in the U.S. became safer after the late 1960s because
A．the U.S. Senate passed laws requiring federal mine inspections.
B．the U.S. Congress passed laws requiring federal mine inspections.
C．the U.S. health and safety officials passed laws requiring federal mine inspections.
D．the U.S, mine companies passed laws requiring federal mine inspections.
单项选择题
According to the passage, why do many fish stay in groups
A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
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