按照有关规定船舶在航行中（）应测量蓄电池电解液比重.A.每天 B.每周 C.每月 D

下面是用显微镜观察人的口腔上皮细胞的一段叙述：回答以下问题：

拿一块清洁的载玻片，在其中央滴一滴0.7％的生理盐水。用凉开水把口漱净，取一根消毒过的牙签在口腔壁上轻轻刮几下，再把牙签放到载玻片的液滴中涂一下，然后放在显微镜下进行观察。

(1)请纠正叙述中的至少两处错误：

a．________b．________

(2)通常先用低倍镜找到清晰的细胞图像，若要详细观察位于视野某个位置的某个细胞的结构，比如低倍镜视野中看到的图像如图，则应将玻片_______

A．向上移动 B．向右移动 C．向左移动 D．向下移动

转换成高倍镜后，用_______________调节至物像清晰。

(3)使用生理盐水的目的是_______________________。

(4)制作装片前，先将口漱净的目的是_____________。

阅读理解

     Many of us already know about several American superstitions(迷信). Having a black cat cross your

path, walking under a ladder, and breaking a mirror are all bad luck. In addition, there are many other

superstitions that are worth knowing. Understanding them will keep you safe from evil spirits -if you believe

in such things -and impress your American friends when you mention them.

     Like the superstitions in other cultures, American superstitions often involve the things important in daily

life, such as health, numbers, and marriage. For example, have you ever had a cough that would not go

away? According to one American superstition, you should take a piece of your hair and put it between

two slices of buttered bread. Next, feed this hair sandwich to a dog and say, "Eat well, you hound, may

you be sick and I be sound." This will trick the evil spirits and help your cough. It will also raise some

eyebrows if you try it.

     In American superstitions, the number three is very important. Often, Americas will say, "All things

come in threes." Three is lucky because it represents the traditional family: mother, father, and child.

Therefore, gifts, letters, and guests will often arrive at your home in groups of three. However, it is also

possible for bad events, like accidents and funerals, to come in threes as well.

     Another time people pay attention to superstitions is when they get married. During a wedding, brides

must wear or carry "something old, something new, something borrowed, and something blue". The old

and borrowed things will bring luck to the person who gives them to the bride. The new and blue things

will bring good fortune to the bride herself. The next time someone you know is getting married, be sure to

recite this phrase.

     As it would be unlucky to discuss one more superstition, we will wind things up here. Keep your fingers

crossed, and stay lucky!

1. The passage is most probably entitled _____.       

A. American's Bad Luck

B. Cross-culture and Superstitions

C. American Superstitions

D. Daily Life in Superstitions

2. The underlined sentence in the second paragraph "It will also raise some eyebrows if you try it."

means _____.       .

A. when you try it, the dog will raise its eyebrows.

B. you will make people surprised when you try this trick

C. only if you raise your eyebrows can the trick work

D. you will believe in the trick after you try it

3. In American's view, the number three is a(n) _____ number.

A. lucky

B. unlucky

C. special

D. ordinary

4. On the wedding, the bride often uses old and borrowed things so as to _____.         .

A. save some money for the wedding

B. bring good luck to the people who give them to the bride

C. give the good luck to the bride herself

D. pass the bad luck to others

5. After reading the passage, we may feel it is written in a _____ tone.

A. formal

B. serious

C. humorous

D. critical

下列哪项不属于磁疗的作用（）

A.止痛

B.镇静

C.消炎

D.消肿

E.增强肌力

煤尘爆炸造成人员大量伤亡的原因是（）。

A、产生大量有害气体

B、强烈的冲击波和火焰

C、高温高压

汉代四神纹