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【简答题】
设定义域为R的函数f（x）= 2 x+1 a+ 4 x 为偶函数，其中a为实常数． （1）求a的值，指出并证明该函数的其它基本性质； （2）请你选定一个区间D，求该函数在区间D上的反函数f -1 （x）．
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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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