单项选择题

Passage Two
Questions 29 to 31 are bused on the passage you have just heard.

A．Protecting roads along the shore.
B．Building on beaches with seawalls.
C．Adding sand to beaches with seawalls.
D．Stopping building seawalls.

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According to Mary Czerwinski’s research, computer users are constantly shifting from window to window, pausing ______ at each one.

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