下列反应对应的离子方程式书写正确的是（）。 A．漂白粉露置在空气中失效：ClO－

词汇（10分）

小题1:I hope you and your classmates will enjoy ________(you) during your trip.

小题2:Not everyone is as ___________(humour) as Mike.

小题3:-----Are you better today?-----No, I am even _______(ill) now.

小题4:Li Fang is the _________(shy) of all the girls in her class.

小题5:Let’s go and ________(cheerful) for your school volleyball team.

小题6:After a long time and much effort, the climbers ____________(final) reached the top.

小题7:Look! Those_________(swim) are trying to swim across the lake.

小题8:For Linda, __________(keep) fit is not easy because she is very lazy.

小题9:Jim is always willing_______(help) his classmates with their problems

小题10:________ (luck), the climbers helped him to come down from the hill.

某同学探究弹力与弹簧伸长量的关系。

（1）将弹簧悬挂在铁架台上，将刻度尺固定在弹簧一侧，弹簧轴线和刻度尺都应在______方向（填“水平”或“竖直”）；

（2）弹簧自然悬挂，待弹簧______时，长度记为L₀，弹簧下端挂上砝码盘时，长度记为L_x；在砝码盘中每次增加10g砝码，弹簧长度依次记为L₁至L₆，数据如下表表：

表中有一个数值记录不规范，代表符号为_______。由表可知所用刻度尺的最小长度为______。

（3）下图是该同学根据表中数据作的图，纵轴是砝码的质量，横轴是弹簧长度与_________的差值（填“L₀或L₁”）。

（4）由图可知弹簧和的劲度系数为_________N/m；通过图和表可知砝码盘的质量为_________g（结果保留两位有效数字，重力加速度取9.8m/s²）。

下列对文件系统的多级目录结构的描述正确的是

A．线性结构

B．树形结构

C．散列结构

D．双链表结构

胆固醇合成的主要场所是

A．肾

B．肝

C．小肠

D．脑

E．胆