下列说法中,正确的个数有 ①两条不相交的直线叫做平行线;②两条直线相交所成的四个

题型:选择题

问题:

下列说法中,正确的个数有

①两条不相交的直线叫做平行线;②两条直线相交所成的四个角相等,则这两条直线互相垂直;③经过一点有且只有一条直线与已知直线平行;④如果直线a∥b,a∥c,则b∥c. [ ]

A.1个

B.2个

C.3个

D.4个

考点:平行线的性质,平行线的公理
题型:选择题

When does music in public places become noise pollution?

You may like at least some kind of music. But the problem is that, in lots of places, you’re made to hear somebody else’s choice in music. Say you’ve just landed at an airport. At the airport, the “background” (背景)music may be played loudly.

When you are on the way to your hotel, there may be another kind of music played by the taxi driver. Then you finally reach your hotel. But when you are taking the elevator(电梯),there is elevator music.

You go out to dinner and end up in a place where the owner of the restaurant thinks music will help make you eat more and spend more. Then a person playing the violin comes around. This is called the “music wallpaper”. It is to make you buy more and eat a lot.  Even the government thinks this is “noise pollution,” especially when the music is too loud.

Noise pollution may be bad for our hearing. It’s also bad for some of our daily activities, such as sleeping, conversations and so on.

The fact that you can’t see, taste or smell it may help explain why it has not received as much attention as other kinds of pollution, such as air pollution or water pollution. The air around us is always filled with sounds, but most of us would not think we are surrounded(包围) by noise. This can be bad for our health. So many people like soft and quiet music in their house.

小题1:In the restaurant, the music is to make you _____________.

A.have a nice meal

B.eat more food and spend more money

C.enjoy some wonderful music

D.have a great time in the restaurant小题2:This passage doesn’t talk about ___________.

A.food pollution

B.water pollution

C.air pollution

D.noise pollution小题3:Music in public places becomes noise pollution because __________.

A.it’s played at the airport

B.it’s played by the taxi driver

C.it’s played when you are taking the elevator

D.you are made to hear someone else’s choice in music小题4:From the passage we know that ___________.

A.music that is too loud is bad for our health

B.people pay as much attention to noise pollution as they do to air pollution

C.people like loud music in their house

D.most people think that there’s lots of noise around us

题型:选择题

鼻源性球后视神经炎的治疗()

A.切开引流、全身抗炎、促进鼻窦通气引流,后期行鼻窦手术

B.积极治疗急性鼻窦炎

C.即早施行筛窦和蝶窦开放术,全身应用抗生素、糖皮质激素

D.及早施行视神经减压术

E.药物治疗

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胃癌的转移特点不包括()

A.经淋巴道转移至左锁骨上淋巴结

B.经淋巴道扩散至肝门淋巴结

C.晚期经门静脉转移至肝脏

D.种植性转移至大网膜淋巴结

E.种植性转移至卵巢

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简述手淫的原因。

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计算题:已知某高炉某日综合冶炼强度为1.05t/(m3·d),综合焦比500kg/t,那么该日利用系数是多少?

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