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【简答题】
(12分)铁生锈是比较常见的现象，某实验小组为研究铁生锈的条件，设计了以下快速、易行的方法： 首先检查制取氧气装置的气密性，然后按上图所示连接好装置，点燃酒精灯给药品加热，持续3分钟左右，观察到的实验现象为：①直形导管中用蒸馏水浸过的光亮铁丝表面颜色变得灰暗，发生锈蚀；②直形导管中干燥的铁丝表面依然光亮，没有发生锈蚀；③烧杯中潮湿的铁丝表面依然光亮。 试回答以下问题： (1)由于与金属接触的介质不同，金属腐蚀分成不同类型，本实验中铁生锈属于____________。 (2)仪器A的名称为____________，其中装的药品可以是________，其作用是________。 (3)由实验可知，该类铁生锈的条件为____________________________________ ____________________________________。 决定铁生锈快慢的一个重要因素是________。
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【单选题】Which of these statements is NOT true, according to the reading passage? Their journeys were long, tiring and often dangerous, so ______.
A.
they had to arm themselves with wooden sticks
B.
they protected themselves with stone clubs
C.
they had to travel in groups
D.
they never traveled at night
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
A.
install smoke detectors in the homes of residents in the community.
B.
check homes to see if smoke detectors have been properly installed.
C.
develop fire safety programs for community leaders and school teachers.
D.
speak to school children about the importance of preventing fires.
【单选题】Country and folk music have a lot in common, but the basic differences are:
A.
In folk , the songs are often about political issues and events, country music songs are usually about personal issues.
B.
There are many styles and subgenres of Country Music in these days.
C.
Generally speaking, country music groups are larger than folk music singing groups.
D.
All of the above.
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
A.
50% better chance of surviving a fire.
B.
50% better chance of preventing a fire.
C.
75% better chance of detecting a hidden fire.
D.
100% better chance of not being injured in a fire.
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