单选题体育与健康课程区别于竞技运动的主要特点是______。
单选题海洋环境污染的特点是______。
单选题19世纪末20世纪初美国实用主义教育学派代表人物是______。
单选题某固体酸燃料电池以CsHSO4固体为电解质传递H+，其最基本结构如图，电池总反应可表示为：，下列有关说法正确的是______A．电子通过外电路从b极流向a极B．b极上的电极反应式为：C．每转移0.1mol电子，消耗1.12L的H2D．H+由a极通过固体酸电解质传递到b极
单选题人的个性心理特征中最本质、最核心的部分是 。
单选题模型方法是科学探究中经常使用的一种逻辑方法。《标准》设计了一种全新的教学活动——生物模型建构。其中所安排的诸如“培养液中的酵母菌种群数量动态变化”的活动，旨在让学生尝试建立( )A．物理模型B．数学模型C．物质模型D．思想模型
单选题在制作多媒体CAI课件时，需对各种素材进行加工处理，下列工具软件中，用于处理音频的是______。
单选题已知全集U=R，A={x｜x≤0)，B={x｜x≥1}，则集合=
单选题用户可以用IE提供的______功能来保存自己常去访问的站点网址，以便日后再次访问时可以从列表中选择。
单选题I was ______ and all of my equipment ______ working well.
单选题已知函数f(x)=2x-5，h(x)=f
2
(x)-20，则h(x)=f(x)的解的个数为______．
单选题英国的湖畔派诗人包括______。
①华兹华斯 ②雪莱 ③拜伦 ④骚塞 ⑤柯勒律治
单选题教师在制作教学课件时，应注意字体颜色的搭配，这是因为______。
单选题After the birth of my second child, I got a job at a restaurant. Having worked with an experienced
1
for a few days. I was
2
to wait tables on my own. All went
3
that first week. When Saturday night came, I was luckily
4
the tables not far from the kitchen.
5
, I still felt it a little hard to carry the heavy trays(托盘).
Before I knew it, the
6
was full of people. I moved slowly,
7
every step. I remember how
8
I was when I saw the tray stand near the tables; it looked different from the one I was
9
on. It had nice handles, which made it
10
to move around. I was pleased with everything and began to
11
I was a natural at this job.
Then, an old man came to me and said, "Excuse me, dear, my wife and I loved
12
you work. It seems your tray stand has been very
13
to you, but we are getting ready to
14
now, and my wife needs her
15
back."
At first his
16
did not get across. "What was he talking about!" Then, I got it. I had set my trays on his wife"s orthopedic walker( 助步器). I stood frozen as ice, but my face was
17
I wanted to get into a hole and
18
.
Since then, I have learned from many mistakes such as the one I just
19
I have learned to be more
20
and not to be too sure of myself.
单选题将氢氧化钠稀溶液滴加到醋酸稀溶液中，下列各图示意混合溶液有关量或性质的变化趋势，错误的是______
单选题教育法律关系中两个最重要的主体是( )。
单选题David is good ______ English，but he doesn't do well ______ PE．A. at; onB. at; inC. at; withD. in; at
单选题遗忘的进程是不平衡的，其规律是先快后慢，其曲线呈______。
单选题( )需要得不到满足，容易使人产生孤独感。
单选题第一届欧洲杯在______举行。