依据《中国南方电网有限责任公司电力安全工作规程》，导线连接网套较大截面的导线穿入网套

根据首字母或汉语提示写单词，使句子通顺，意思完整。

1. W________ comes after Tuesday.

2. Jim's favorite subject is c________.

3. Ten and twenty is t________.

4. Japan is an A________ country.

5. His brother i________ me to have supper with him tonight.

6. Her mother buys her two________ (双) of socks.

7. There are many ________ (狼) in the forest.

8. ________ (跑步) is my favorite sport.

9. There are many famous ________ (大学) in the world.

10. What are your ________ (功课) today?

如图是用显微镜观察植物细胞临时装片的两个视野，要把视野中的物像从甲图转变为乙图，下列操作步骤正确的排序是（　　）

①转动细准焦螺旋    ②调节光圈     ③移动装片        ④转动转换器．

A．③→①→②→④

B．④→③→②→①

C．③→①→④→②

D．③→④→②→①

Only after Mary read her essay the second time            the spelling mistake.

A．did she notice.

B．she notice.

C．does she notice

D．she has noticed

如图所示，A、B是两个圆形气缸，中间有横截面为“T”型的活塞，活塞可以无摩擦地左右滑动，且两侧面积＝1/10，a、b、c为三个通气口．开始时，三个通气口都与大气相通活塞静止，并且距两端都是L，环境温度为27℃．现用容积可忽略的细管将a、b两口相连，而c口始终与大气相通，给整个装置均匀加热，使温度达到127℃，求活塞移动的距离和方向．

某些社会经济现象，随着季节的更换或社会因素的影响而引起的在年度内比较有规律性的变动称（），测定它的变动常用且最简便的方法是（）。