19.答案A

　　【解析】根據(jù)分析，本句中的“this”和“even more basic”分別指代上句的“interaction with other human beings”和“necessary”，此處所填詞對應(yīng)上文中的language development。也就是說，language acquisition語言習(xí)得。appreciation欣賞,感激;requirement要求;alternative轉(zhuǎn)移，轉(zhuǎn)變，轉(zhuǎn)換。

　　20.答案C

　　【解析】本句功能是以另一種方式解釋前文中的“imitative, learned behavior.(模仿性的后天行為)”。In other words換言之，換句話說;As a result結(jié)果是;After all畢竟;Above all首先。

　　Many students find the experience of attending university lectures to be a confusing and frustrating experience.

　　The lecturer speaks for one or two hours, perhaps __1__ the talk with slides, writing up important information on the blackboard, __2__ reading material and giving out __3 __.

　　The new student sees the other students continuously writing on notebooks and __4__ what to write.

　　Very often the student leaves the lecture __5__ notes which do not catch the main points and __6__ become hard even for the __7__ to understand.

　　Most institutions provide courses which __8__ new students to develop the skills they need to be __9__ listeners and note-takers.

　　__10__ these are unavailable, there are many useful study-skills guides which __11__ learners to practice these skills __12__ .

　　In all cases it is important to __13__ the problem __14__ actually starting your studies.

　　It is important to __15__ that most students have difficulty in acquiring the language skills __16__ in college study.

　　One way of __17__ these difficulties is to attend the language and study-�瞫kills classes which most institutions provide throughout the __18__ year.

　　Another basic __19__ is to find a study partner __20__ it is possible to identify difficulties, exchange ideas and provide support.

　　1.A.extending B.illustrating C.performing D.conducting

　　2.A.attributing B.contributing C.distributing D.explaining

　　3.A.assignments B.information C.content D.definition

　　4.A.suspects B.understands C.wonders D.convinces

　　5.A.without B.with C.on D.except

　　6.A.what B.those C.as D.which

　　7.A.teachers B.classmates C.partners D.students

　　8.A.prevent B.require C.assist D.forbid

　　9.A.effective B.passive C.relative D.expressive

　　10.A.Because B.Though C.Whether D.If

　　11.A.enable B.stimulate C.advocate D.prevent

　　12.A.independently B.repeatedly C.logically D.generally

　　13.A.evaluate B.acquaint C.tackle D.formulate

　　14.A.before B.after C.while D.for

　　15.A.predict B.acknowledge C.argue D.ignore

　　16.A.to require B.required C.requiring D.are required

　　17.A.preventing B.withstanding C.sustaining D.overcoming