阅读文段，回答问题。 思念 舒婷 一幅色彩缤纷但缺乏线条的挂图 一题清纯然而

与体液免疫功能相关的指标应除外 （）

A.血清Ig水平

B.B细胞数量

C.淋巴细胞转化率

D.溶血空斑形成率

E.注射类毒素后体内抗毒素水平

When you stop and think about your high school or college alma mater, were your experiences more positive or negative Do your feelings of (1) in that school have anything to do with whether or not your school was single-sex or coed (2) to send their children to single-sex schools, because they feel both (3) when they study in the company of students of the same sex. They (4) .
For years, only parents who could afford to send their children to private schools, or who had (5) , chose single-sex education for their children. Single-sex schooling was (6) for most American families. Today, however, along with (7) , public schools are experimenting with the idea of (8) .
Girls may be the ones who benefit most from single-sex schooling. Studies have shown that (9) in coed classrooms because teachers sometimes pay more attention to boys. Girls’ (10) toward their studies tends to disappear as they begin to feel less successful. They start to (11) outperform them in math and science. As boys (12) , girls start to lose it. Moreover, adolescence is (13) for girls. As they experience adolescent changes, some girls become depressed, develop an addiction, or suffer from (14) .
In the early 1990s, some influential people said that being in single-sex classes could (15) . Schools across the country began creating single-sex classrooms and schools. But many critics claim that (16) may actually be detrimental to a girl’s education because they (17) of sex differences.
The renewed interest in single-sex schooling (18) among Americans. Those who give it full endorsement believe girls need an all-female environment to take risks and find their own voices. Those who (19) of single-sex schooling wonder whether students’ lack of achievement warrants returning to an educational system that divides the sexes. They believe there is no (20) .

大学生心理健康教育的原则有（）

A.全体与个别兼顾的原则；

B.科学性原则；

C.主体性原则；

D.发展性原则

风轮实度是指叶片在（）与（）的比值，实度大小取决于（）。

磷酸氢钠干粉是以含量不少于（）的磷酸氢钠为原料的干粉。

A、60%

B、70%

C、80%

D、90%