在国际单位制中,电阻单位是 A.伏特 B.欧姆 C.安培 D.瓦特 答案:B 【分析】 在国际单位制中,电学中的好多单位都是为了纪念科学家们在物理学做出的突出贡献,以他们的名字命名的,如:电荷量-库仑、电流-安培、电压-伏特、电阻-欧姆、电功-焦耳、电功率-瓦特,据此分析. 【详解】 在国际单位制中伏特是电压的单位、安培是电流的单位、瓦特是电功率的单位4、 Of all the
websites,one that has attracted attention recently is
myspace.com.Most of this attention has come from the
media and tells every reason why the website should be shut down.The threat of internet predators(窃掠者)is
indeed a tough reality,but shutting down the site is
not the answer.If myspace.com were shut down,another site would quickly take its place.Therefore,the right way is to teach teens how to use the site safely and
educate them about who may be predators and how to avoid them.
The key to staying safe on the
Internet is to make sure that your profile(个人资料)is secure.The simplest way is to change the
privacy setting on your profile to “private”, which protects your information so that only the people on your
friend list can view it.Although this is effective,it is not perfect.Predators can find ways to
view your profile if they really want to,whether
through hacking in or figuring out their way onto your friend list.Thus,you should never post too much personal
information.Some people actually post their home and
school addresses,date of birth,and
other personal info,often letting predators know
exactly where they will be and when.The most
information that is safe is your first name and province.Anything more is basically inviting a predator into your life.
Another big issue is photos. I
suggest completely skipping photos and never posting a photo of a friend online
without asking permission.
Most importantly, never,under any circumstances,agree to a real-life meeting with anyone you meet online.No matter how well you think you know this person, there are no
guarantees that they have told the truth.But you could
feel free to chat with people you meet on the site, but just remember that not
everyone is who they say they are.Hopefully,the next time you edit your profile,you’ll be more informed about the dangers of internet predators and take
the steps to defend yourself.
1.Kids can avoid web predators successfully by
.
A.attracting more public attention
B.shutting down the website “myspace
. com”
C.showing the kids ways to try other sites
D.recognizing and getting away from them
2.The safest basic personal information that you can
share online is .
A.your home address and birthday
B.school address and your
first name
C.your first name and province
D.your
province and cell phone number
3.We can learn from the passage that
.
A.not everybody you meet on line is honest and reliable
B.it is not acceptable to post a photo of a friend on
line
C.it is not safe by chatting with grown-ups on the
website
D.only you and your friends can view your personal
profile
4.What could be the best title of this passage?
A.Web Safety for teens
B.Personal Safety
C.Web Hackers in the
past D.Predators’ Tricks