15．In order to know a foreign language thoroughly（完全地），four things are necessary．First，we must understand the language when we hear it spoken． Secondly，we must be able to speak it ourselves，with confidence（自信） and without hesitation（猶豫）． Thirdly，we must do much reading． Finally，we must be able to write it． We must be able to make sentences that are correct in grammar．
There are no shortcuts to success in language learning． A good memory is a great help，but it is not enough only to memorize the rules from a grammar book． It is not much learning by heart long lists（一覽表） of words and their meanings，studying the dictionary and so on． We must learn by using the language．
If we are pleased with a few rules we have memorized，we are not really learning the language． We must"learn through use．"Practice is important． We must practise speaking and writing the language whenever we can．
46． The most important things to learn a foreign language areB．
A．understanding and speaking
B．listening，speaking，reading and writing
C．writing and understanding
D．memorizing and listening
47．Someone hears and writes English very well，but he speaks it very badly． This is becauseD．
A．he doesn't understand the language when he hears it spoken
B．he doesn't have a good memory
C．he always remembers lists of words and their meanings
D．he often hesitates（猶豫） to practise speaking it
48． One can never learn a foreign language well byB．
A． doing much practice
B． studying the dictionary
C． learning through use
D． using the language
49．Which is the most important in learning a foreign language？C
A．A good memory．B． Speaking． C． Practice． D． Writing．
50．"Learn through use"meansD．
A．we use a language in order to learn it
B．we learn a foreign language in order to use it
C．we can learn a language well while we are keeping using it
D．B and C．
