23． One can never learn a foreign language well by ＿＿＿＿＿．

　 A． doing much practice　　　　 B． studying the dictionary

　 C． learning through use　　　　 D． using the language

22． Someone hears and writes English very well， but he speaks it very badly． This is because ＿＿＿＿＿．

　 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(犹豫) to practise speaking it

21． The most important things to learn a foreign language are ＿＿＿＿＿.

　 A． understanding and speaking　 B． listening， speaking， reading and writing

　 C． writing and understanding　　　 D． memorizing and listening

20．In fact，＿＿＿＿＿＿＿ ．

　 A．Charlie failed that day　 B．the student in the back row didn't watch her teacher carefully

　 C．the student in the back row hadn't learned chemistry before

　 D．Charlie failed in making the experiment

E

　 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(犹豫)． 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(一览表) 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．

19．The students couldn't answer Charlie's questions because ＿＿＿＿＿＿＿ ．

　 A．none of them had seen the atoms　　　　　　 B．they didn't understand their teacher

　 C．the chemical reaction was too complicated　　 D．they all wanted to drop the subject

18．That day Charlie wished ＿＿＿＿＿＿＿ ．

　 A．his students could learn the chemical reactio

　 B．his students could find the atom of carbon

　 C．his students could count(数) the atoms of carbon

　 D．his students could make the experiment

17．Charlie hopes ＿＿＿ ，so he does his best to make his classes lively and interesting．

　 A．all his students could understand him　　　 B．his students wouldn't be afraid of him

　 C．his students carefully watched him making the experiment

　 D．his students could do well in chemistry

16．Charlie began to work in the middle school because ＿＿＿＿＿＿＿．

　 A．he had been in the school for four years　 B．he couldn't do anything except teaching

　 C．he hoped to become a good teacher　　　 D．he did well in all his subjects

15．According to the passage， many other inventions were ＿＿＿＿＿＿＿．

　 A．the dreams of Christopher　　　 B．the results of Christopher's experiment

　 C．the cause of Christopher's idea　 D．the wishes of Christopher

D

　 Charlie studied in a famous college for four years． He studied hard and did well in all his subjects． He hoped to become a good teacher． This year he left the college and began to work in a middle school． He likes his students and is strict(严格的) with them． He does his best to make his classes lively and interesting．

　 One day he carefully explained a chemical reaction(反应) to the students of Grade 2 in the chemistry lab．

　 “Be careful， everyone，” he said loudly． “Before I make the experiment，there're twenty five atoms of carbon(碳原子)，but after I finish it， there're twenty four atoms of carbon left！”

　 He stopped to watch the classroom and hoped his students would go on explaining it． But the young men looked at each other and nobody answered him． He had to ask， “What happens？ What makes the atom lost？”

　 The classroom was very quiet and none of the students looked at their teacher．

　 “Who can tell us where it has gone？”

　 Suddenly a soft voice came from the back row， “We did not see anybody leave the lab！”

14．Which of the following can push the hovercraft forward rapidly？

　 A．Cushioned air．　　　　　　 B．The air that sucked in．

　 C．The air that blew out．　　　 D．The air on the surface．