下列生活中常见的变化中属于化学变化的是( )

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问题:

下列生活中常见的变化中属于化学变化的是(  )

考点:物理变化和化学变化的特征和判别物理性质和化学性质的区别和应用氨气的性质二氧化硫的性质
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在边际贡献大于固定成本的情况下,下列措施中可能会导致总杠杆系数提高的是()。

A、增加产品销量

B、提高产品单价

C、提高资产负债率

D、节约固定成本支出

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阅读理解。

     Different countries have different customs. When you travel to another countries, please follow their

customs, just as the saying goes, " ______"

     Very often people who travel to the United States forget to tip (付小费). It is usual to tip porters who

help carry your bags, taxi drivers and waiters. Waiters expect to get a 15% tip on the cost of your meal.

Taxi drivers expect about the same amount.

     In England, make sure to stand in line even if there are only two of you. It's important to respect lines

there. It's a good idea to talk about the weather. It's a favorite subject of conversation with the British.

     In Spain, it's a good idea to have a light meal in the afternoon if someone invites you for dinner. People

have dinner very late, and restaurants do not generally open until after 9 pm.

     In Arab countries, men kiss one another on the cheek (脸颊). Your host may welcome you with a kiss

on both cheeks. It is polite for you to do the same.

     In Japan, people usually give personal or business cards to each other when they meet for the first time.

When a person gives you a card, don't put it into your pocket right away. The person expects you to read it.

     Don't forget to be careful of your body language to express something In conversation. A kind of body

language that is acceptable in one culture may be impolite in another.

1. When you travel to the USA, you don't need to tip ______.

A. porters

B. waiters

C. 70 minutes

D. 90 minutes

2. The missing sentence in the first paragragh should be "______".

A. Love me, love my dog

B. He who laughs last laughs best

C. When in Rome, do as the Romans do

D. Where there is a will, there is a way

3. The underline word "porters" in the passage means ______.

A. 搬运工

B. 清洁工

C. 接线员

D. 售票员

4. Which of the following is TRUE according to the passage?

A. In Spain, People usually have dinner very early

B. In England, It's a not polite to talk about the weather

C. In Arab countries, men kiss one another on the cheek

D. In Japan you should not read the business card as soon as you get it.

5. What's the best title of the passage?

A. How to Tip

B. Body Language

C. When to Have Dinner

D. Advice to International Travellers

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地球上所有的生物只有一个家,这就是______.它包括______的大部、______和______的底部,它以海平面为标准来划分,深度大致为20千米.

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南极洲最丰富的自然资源是(  )

A.煤炭

B.铁矿

C.生物资源

D.淡水资源

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对于承租人来说,设备租赁与设备购买相比的不足之处在于()。

A.不能用于抵押贷款

B.无税费上的利益

C.受通货膨胀的冲击

D.不能获得良好的维修服务

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