DuolingoCost：FreeThislanguagelearningappofferscoursesinSpanish，French，Italian，GermanandPortuguese．Andit'snotallaboutreadingandwriting-itusesthephone'smicrophonetotestusers'pronunciationskillsaswell．LumosityCost

Question

Duolingo
Cost：Free
This language learning app offers courses in Spanish，French，Italian，German and Portuguese．And it's not all about reading and writing-it uses the phone's microphone to test users'pronunciation skills as well．
Lumosity
Cost：Free trial；﹩14 per month．
Lumosity aims to improve users'thinking abilities by using simple games and tests that adapt to users'cognitive．（认知的） levels to improve their memo ry and attention．The company says no two users will have the same experience．More than 18 millio n people have downloaded it．
Daily art
Cost：Free．
Each day the app presents a different-classic painting from storied artists such as Vincent Van Vogh and Monet．Even if you have known the work，you may not know all the fascinating details the app serves up on the back story of the art．
Vocabulary．com
Cost：﹩2.99 per month．
Never again get embarrassed using the wrong word at a dinner party with this app．It has more than 120，000questions that can help you learn over 12，000 words．Users can even battle their friends to see who the biggest word master is．
Today's documents
Cost：Free．
The U．S．National，Archives manages this educational app，which serves up a historical document or photo each day of the year．Past documents include everything from a letter by Woodrow Wilson creating Mother's Day to a photo of Gerald Ford as a baby．

21．Where must these apps mentioned in the passage be used？___
A．On the computer．
B．In the movie．
C．In the car．
D．On the phone．
22．What can we know about the app Lumosity？___
A．It provides the same text．
B．It can solve mental problems．
C．It is very popular．
D．It's totally free．
23．How much should you pay per year for using the app to learn words？___
A．﹩2.99．
B．﹩14．
C．﹩35.88．
D．﹩168．
24． Which would you download if you'd like to know more about the past？___
A．Today's documents．
B．Vocabulary．com．
C．Duolingo．
D．Daily art．

Answer 1

21．D，细节理解题，根据句子it uses the phone's microphone；More than 18 millio n people have downloaded it；等可以推测这些软件都必须在手机上使用，故答案为D． 22．C，推理判断题，根据句子More than ...