问题 选择题

在下列代数式中,次数为3的单项式是

A.x3+y3

B.xy2

C.x3y

D.3xy

答案

答案:B

题目分析:A. x3+y3是三次二项式;

B. xy2是三次单项式,故选B;

C. x3y是四次单项式;

D. 3xy是二次单项式。

点评:该题较为简单,主要考查学生对单项式和多项式以及对其次数、系数概念的理解。

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Strange Baby-Naming Laws

Germany Parents are banned by law from using last names and the names of objects and products as first names. A child’s first name must clearly indicate his or her sex, and all names must be approved by the office of vital statistics in the area in which the child was born.

Iceland The country’s naming committee consults the National Register of Persons to determine if a name is acceptable. If parents want to go off-list, they must apply for approval and pay a fee, and the name must contain only letters in the Icelandic alphabet.

New Zealand The country’s Births, Deaths, and Marriages Registration Act of 1995 prohibits parents from choosing a name that “ might cause offense to a reasonable person; is unreasonably long; or is, includes, or resembles an official title or rank,” including, apparently, Adolf Hitler and Yeah Detroit—both names recently rejected.

Denmark If Danish parents prefer a moniker not on the list of 7,000 preapproved baby names, they must get permission from local church and government officials. Fifteen to 20 percent of the 1,100 reviewed names—including creative spellings of common names, last names as first names, and unusual names—are rejected each year.

小题1:You can tell whether a baby is a girl or a boy according to the first name in _____.

A.Denmark

B.New Zealand

C.Iceland

D.Germany小题2:In Iceland, the names should _____.

A.be approved by the office of vital statistics.

B.be accepted by the National Register of Persons.

C.contain only letters in the Roman alphabet.

D.be paid for some money.小题3:Which name is accepted in New Zealand?

A.Bin Laden

B.Talula Does The Hula

C.Keenan Got Lucky

D.John Smith小题4:According to the passage, which of the following is true?

A.Danish babies’ names should be on the list if parents can’t get the permission.

B.Each year about 150-200 reviewed names are rejected in Denmark.

C.Adolf Hitler is banned in Iceland.

D.Parents should pay a fee for babies’ names if the names are rejected.