问题
单项选择题 A1/A2型题
正常脑脊液氯化物浓度与血浆氯化物浓度相比（）。
A.较低
B.两者相等
C.较高
D.较血浆高1倍
E.较血浆低一半
答案
参考答案：C
解析：本题考查脑脊液氯化物与血浆氯化物的关系。正常脑脊液氯化物比血浆氯化物高，这是因为脑脊液要维持Donnan平衡所致。
搜题请搜索小程序“爱下问搜题”
正常脑脊液氯化物浓度与血浆氯化物浓度相比（）。
A.较低
B.两者相等
C.较高
D.较血浆高1倍
E.较血浆低一半
参考答案：C
解析：本题考查脑脊液氯化物与血浆氯化物的关系。正常脑脊液氯化物比血浆氯化物高，这是因为脑脊液要维持Donnan平衡所致。
| Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can best adapt them selves to such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. (53) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (54) that comes from achieving success and knowing that their accomplishments are (55) by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (56) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (57) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide (58) opportunities for leadership, as well as for practice in successful (59) dynamics. Making friends is extremely important to teenagers, and many shy students need the (60) of some kind of organization with a supportive adult barely visible in the background. |
A．If
B．Although
C．Whereas
D．Because