Studies in single-sex schools show that ______. A: smaller class brings lower achievements of the students B: special attention encourages the students to do better in class C: single sex is the only factor that influences the students' behaviors D: single sex helps the students learn more in class

The author argues that single sex schools were established solely for the benefit of girls.

Final clubs are usually single-sex and old-fashioned. ( )

Some educators begin to teach girls and boys separately because ______. A: some researches suggest that boys and girls do not study in the same way B: they are inspired by the success of Young Women's Leadership School C: researches in single-sex class prove that it works better for education D: problems in coeducation show that a single-sex school might be a better choice

Hip replacement surgery is______joint replacement surgery in the U.S. A: the single most frequent B: the most single frequent C: the single frequent D: a single frequent

查询性别为男的信息，条件怎么写 A: where sex !=’男' B: where sex not in 男 C: where sex ='男' D: where sex between 男

d={'name':'alice','age':19,'sex':'F'},不能删除’sex’项目的操作的是（） A: del d['sex'] B: d.pop() C: d.pop('sex') D: d.clear()

下列数组声明语句中， 不正确的是___________。 A: Dim a(5) As Single B: Dim a(1 To 5) As Single C: Dim a(0) As Single D: Dim a(5) As Single=(1，2，3，4，5，6)

Which of the following does not lead to the formation of aneuploid gametes? A: Failure of homologous pairs to separate at anaphase B: A mutatation in a single gene located on chromosome 2. C: A pair of sex chromosomes that does not separate during anaphase D: A set of sister chromotids that doest not separate during anaphase I

下面数组初始化语句正确的是（ ）。 A: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10} B: Dim A( ) As Single={1,2,3,4,5,6,7,8,9} C: Dim A(9) As Single={1,”A”,”BC”,2,3,4,5,6,7,8} D: Dim A(9) As Single={1,2,3,4,5,6,7,8,9,10}