单项选择题

16-20


FIVE-DAY WEATHER
TODAY TOMORROW SUNDAY MOMDAY TUESDAY
High 29 High 28 High 27 High 26 High24
Low 21 Low20 Low 19 Low17 Low16
Variably cloudy Mainly cloudy with isolated showers ending in the afternoon Sunny with cloudy periods developing in the afternoon Thunder howers (POP 80%) Windy with thundcrshowcrs and possibly storm in the north
Sunrise: Sunrise: Sunrise: Sunrise: Sunrise:
6:35 a.m. 6:36 a.m. 6:38a.m 6:40 a.m. 6:42 a.m.
Sunset: Sunset: Sunset: Sunset: Sunset:
8:04 p.m. 8:02 p.m 8:00 p.m. 7:57 p.m. 7:55 p.m.
What does "POP" probably mean（）

A．Places of presence．
B．Patterns of presence．
C．Period of presence．
D．Probability of presence．

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单项选择题
What is the focus of this passage（）

A．How firefighters carry out their responsibilities.
B．The proper installation of home smoke detectors.
C．The detoction of dead-air space on walls and ceilings.
D．How smoke detectors prevent fies in homes.
单项选择题
Many of them will lead () and you have to try something different

A．anywhere
B．nowhere
C．everywhere
D．somewhere
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