对网络数据库进行评价时通常不用考虑以下哪方面的因素？（） A._爱下问搜题

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问题单项选择题

对网络数据库进行评价时通常不用考虑以下哪方面的因素？（）

A.内容是否准确无误，及时更新

B.来源是否权威可信

C.检索是否方便高效

D.是否收费

答案

参考答案：D

解析：对网络数据库进行评价时主要是对其内容进行评价，一般不考虑它是否收费。

完形填空

完形填空。

     Many people around the world study English.  English is spoken in more
than forty _1   all over the world.  It is the only    2    that is spoken in so
many countries.  If you learn English well, it will be much easier for you
to   3   with people in English-speaking countries. It is not easy to learn
English,_4 you need to work hard. Where there is a will, there is a   5   . You can watch English   6    programs,English films on DVD or videos. You can   7   with your classmates in and out of class. You can speak to foreign
friends   8   the phone in English. You can also read English books,
newspapers and magazines and _ 9    letters or e-mails to your friends in
English.  If you study hard, you are    10    to make progress.

( )1. A. countries
( )2. A. sport
( )3. A. communicate
( )4. A.but
( )5. A.road
( )6. A.tape
( )7. A.ask
( )8. A.in
( )9. A.write
( )10.A.tired

B. cities
B. language
B. compete
B.because
B.street
B.TV
B.reply
B.for
B.send
B.kind

C. schools
C. culture
C. fight
C.so
C.path
C.MP3
C.talk
C.to
C.post
C.sure

D. villages
D. art
D. travel
D.then
D.way
D.computer
D.listen
D.on
D.give
D.ready

选择题

如图所示，一质点沿螺旋线自外向内运动，已知其走过的弧长s与时间t成正比．关于该质点的运动，下列说法正确的是

A．质点运动的线速度越来越大

B．质点运动的加速度越来越大

C．质点运动的角速度越来越小

D．质点所受的合外力越来越小