一般从劳动合同的期限与试用期的关系来看，劳动合同期限短的，试用期应（） A.取消 B

阅读理解。

    Jean is bright a young woman who comes from a rich and famous family. She goes to a good university

and has everything that money can buy. Well, almost everything. The problem is that the people in Jean's

family are so busy that they can hardly find time to be with her. In fact, Jean is quite lonely.

    So Jean spends a lot of her time on QQ. She likes being anonymous (不知姓名的,名字不公开的), talking

to people who do not know about her famous family and her rich life. She uses the name Linda on QQ and

has made a lot of friends who she contacts quite often.

    Last year Jean made a very special friend on QQ. His name was David and he lived in San Francisco.

David was full of stories and jokes. He and Jean had a common interest in rock music and modern dance.

So it always took them hours to talk happily on QQ and sometimes they even forgot the time. Of course,

they wanted to know more about each other. David sent a picture of himself: He was a tall, good-looking

young man with big, happy smile. As time went by, they became good friends and often sent cards and

small things to each other.

    When Jean's father told her that he was going on business trip to San Francisco, she asked him to let her

go with him, so that she could give David a surprise for his birthday. She would take him the latest DVD of

their favorite rock singer. But when Jean knocked on David's door in San Francisco, she found that the

special friend she had written to was a twelve-year-old boy named Jim.

1. Jean spends a lot of her time on QQ because she is _____. [ ]

A．rich

B．famous

C．young

D．lonely

2. Jean thought "David" was special because _____. [ ]

A．"David" made her quite happy on QQ

B．"David" was from San Francisco

C．"David" sent her a picture of himself

D．"David" was tall, good-looking

3. When Jean and "David" met and introduced themselves to each other, who felt surprised? [ ]

A．"David".

B．Both "David" and Jean.

C．Jean.

D．Neither "David" nor Jean.

4. Which of the following is true? [ ]

A．Jean has got everything in her life.

B．Both "David" and Jean enjoy rock music.

C．"David" didn't tell Jean his real address.

D．Jean's family members often get together.

5. What's the main idea of this passage? [ ]

A．Don't believe those you get to know on QQ so easily.

B．People don't use their real names on QQ so often.

C．Don't go to meet those you get to know on QQ.

D．People should tell their real names to others on QQ.

下列物质中抑制胃酸分泌的是

A．促胃液素

B．乙酰胆碱

C．组胺

D．糖皮质激素

E．生长抑素

（12分）在“探究加速度与力、质量的关系”实验中。

（1）某组同学用如图所示装置，采用控制变量的方法， 来研究小车质量不变的情况下，小车的加速度与小车受到力的关系。下列措施中不需要和不正确的是：            

A．首先要平衡摩擦力，使小车受到合力就是细绳对小车的拉力。

B．平衡摩擦力的方法就是，在塑料小桶中添加砝码，使小车能匀速滑动。

C．每次改变拉小车拉力后都需要重新平衡摩擦力

D．实验中通过在塑料桶中增加砝码来改变小车受到的拉力E.每次小车都要从同一位置开始运动

F.实验中应先放小车，然后再开打点计时器的电源

（2）某次实验中得到的一条纸带如图所示，从比较清晰的点起，每五个打印点取一个点作为计数点，分别标明0、1、2、3、4 ，量得x₁=30.0mm，x₂=36.0mm，x₃=42.0mm，x₄=48.0mm，则小车通过点2时的速度为________m/s，小车的加速度为_______m/s²。

（3）某组同学实验得出数据，画出a－F图像如图所示，那么该组同学实验中出现的问题可能是 ：         　　　　　　　　　　   

《规程》对井下空气温度是如何规定的？

若一个热力系统和外界之间既无热量和机械等能量交换也无物质交换，这种系统称为（）

A.开口系统

B.闭口系统

C.绝热系统

D.孤立系统