填空题：可调出力是指运行和备用设备实际可达到的出力，包括（）和（）出力。

题型：填空题

The following is a recent survey among teenagers:

Radio
     Most teenagers nowadays are not regular listeners to radio. They may occasionally tune in, but they
do not try to listen to a program specifically. The main reason teenagers listen to the radio is for music,
but now with online sites streaming music for free they do not bother, and users can choose the songs
they want instead of listening to what the radio presenter/DJ chooses.

Television
     Most teenagers watch television, but usually there are points in the year where they watch more than
average. This is due to programs coming on in seasons, so they will watch a particular show at a certain
time (as long as it lasts) but then they may watch no television for weeks.
    Teenagers are also watching less television because of services such as BBC iPlayer, which allows
them to watch shows when they want. Whilst watching TV, adverts come on quite regularly (18 minutes
of every hour) and teenagers do not want to watch these, so they switch to another channel, or do
something else whilst the adverts run.

Newspapers
     No teenager that I know of regularly reads a newspaper, as most do not have the time and cannot be
bothered to read pages and pages of text while they could watch the news summarized on the Internet or
on TV.

Internet
     Every teenager has some access to the Internet, be it at school or home. Home use is mainly used for
fun (such as social networking) whilst school (or library) use is for work. Most teenagers are heavily
active on a combination of social networking sites. Facebook is the most common, with nearly everyone
with an Internet connection registered and visiting>4 times week. Facebook is popular as one can interact
with friends on a wide scale.
     For searching the web, Google is the dominant figure, simply because it is well known and easy to
use. Some teenagers make purchases on the Internet (on sites like eBay) but this is only used by a small
percentage, as a credit card is required and most teenagers do not have credit cards. Many teenagers use
YouTube to watch videos (usually anime which cannot be watched anywhere else) and some use it as a
music player by having a video with the music they want to listen to playing in the background.

Mobile Phones
     99pc of teenagers have a mobile phone and most are quite capable phones. Usually, teenagers only use
their phones for texting, calling. Features such as video messaging or video calling are not used-because
they are expensive.
     Services such as instant messaging are used, but not by everyone. It usually depends, whether the
phone is Wi-Fi compatible, because otherwise it is very expensive to get Internet off the phone network.
As most teenagers' phones have Bluetooth support, and Bluetooth is free, they utilize this feature often.
     Mobile email is not used as teenagers have no need; they do not need to be connected to their inbox
all the time as they don't receive important emails.

1. The survey carried out recently is mainly concerned with _____.

A. how teenagers consume media
B. what electric devices teenagers favor
C. which new trend teenagers are following
D. how teenagers contact others and make their social net

2. As is mentioned in the survey, the reason why teenagers watch less TV mainly lies in that _____.

A. teenagers do not watch regular programs
B. all the TV programs are on for only a few weeks
C. teenagers may turn to other devices to watch their favorite
D. the TV adverts coming on every channel are just the same

3. Which of the following is TRUE according to the survey?

A. Radio presenter or DJ used to invite the listeners to choose the songs they want.
B. The main source for teenagers to get news is Internet as well as newspapers.
C. Google is the most common social networking sites due to its convenience.
D. Some features of modern mobile phones are not widely used by teenagers.

查看答案

可调出力是指运行和备用设备实际可达到的出力，包括（）和（）出力。

问题：