[填空题]If two speech varieties are not mutually intelligible, then the speech varieties are considered to be different languages.

[填空题]If two speech varieties are not mutually intelligible, then the speech varieties are considered to be different languages.

[填空题]There are thousands of speech varieties in the world.

[单项选择]Two mutually exclusive projects have conventional cash flows, but one project has a larger NPV while the other project has a higher IRR. Which of the following least likely explains this conflict（）
A. Reinvestment rate assumption.
B. Size of the projects’ initial investments.
C. Risk of the projects as reflected in the required rate of return.

[单项选择]In some speech communities, two languages are used side by side with each having a different role to play. Being able to speak two languages is known as （　）.
A. bilingualism
B. mixture
C. parole
D. blend

[单项选择]In some speech community, two languages are used side by side with each having a different role to play, this is ______.
A. pidgin
B. creole
C. diglossia
D. bilingualism

[单项选择]Sometimes, two varieties of a language exist side by side throughout the community, with each having a definite role to play. This phenomenon is ______ .
A. bilingualism
B. diglossia
C. pidgin
D. creole

[单项选择]A certain species of bird has two basic varieties, crested and noncrested. The birds, which generally live in flocks that contain only crested or only noncrested birds, tend to select mates of the same variety as themselves. However, if a bird that is raised in a flock in which all other members are crested is later moved to a mixed flock, then that bird—whether crested or noncrested—is likely to select a crested mate. This fact indicates that the birds’ preference for crested or noncrested mates is learned rather than genetically determined. Which one of the following, if true, provides the most support for the argument
A. Birds of other species also tend to show preferences for mates that have one or another specific physical feature.
B. In general there are few behavioral differences between the crested and noncrested birds of the species.
C. Both the crested and noncrested birds of the species tend to select mates that are similar to themselves in size and age.
D. If a crested bird of the species is raised in captivity apart form other birds and is later moved to a mixed flock, that bird is likely to select a crested mate.
E. (E) If a bird of the species is raised in a flock that contains both crested and noncrested birds, that bird shows no preference for one variety or the other in its selection of a mate.

[单项选择]（　） is a situation where two varieties of a language exist side by side throughout the community, with each having a definite role to play.
A. Bilingualism
B. Diglossia
C. Bilaterality
D. Diglot

[名词解释]indirect speech act

[填空题]

Where does the speech occur？
The speech occurs（）.

[多项选择]Making a short speech

[单项选择]Adages are frequently mutually antagonistic: witness, “ignorance breeds prejudice” and “familiarity breeds contempt.”（）
A. is at the heart of
B. multiplies
C. worsens
D. generates

[单项选择]The economist said at the conference that mutually beneficial deals were being struck for the provision of investment finance and the transfer of technology.（）
A. transparency
B. transactions
C. transmission
D. transforms

[单项选择]What is this speech about
A. A lecture.
B. A notice.
C. An ad.