带传动是靠摩擦传动，张紧力越大，摩擦力越大，越能正常工作。

Don’t quarrel with your friend, ________will damage your friendship．

A．who

B．which

C．that

D．what

(10分)(1)我国酸雨危害十分严重，是世界三大酸雨区之一，且主要为硫酸型酸雨。形成硫酸型酸雨主要是由于空气中           含量超标。形成硫酸型酸雨发生的主要反应的化学方程式为

途径一：                                       ；

途径二：                                       。

(2)某校科技活动小组的同学采集酸雨样品，每隔一段时间测定样品的pH，得到下列数据：

时间	开始	8 h后	16 h 后	24 h后	32 h后	4O h后	48 h后
pH	5．O	4.8	4.5	4.3	4.2	4．O	4．O

   请根据上述材料，回答下列有关问题：

①酸雨放置时，pH发生变化的主要原因为                                   

(3)你认为减少酸雨产生的途径可采取的措施是                           

A、用煤作燃料  B、把工厂烟囱造高      C、燃料脱硫     D、开发新能源

Guide dogs are going to be available for the children who are unable to see normally in the UK for the first time, as the age limit is to be removed. The Guide Dogs for the Blind Association is to begin training dogs to help blind people under the age of 16.

The association says too many youngsters with impaired eyesight are lacking in independence. They have only a limited social life because of their disability. Giving some of them guide dogs at a younger age is intended to help them to widen their range of activities and to improve their sense of self-confidence and independence. Guide dogs for these teenagers will begin to be provided from next year. There has been an experimental project to test the use of guide dogs with younger people.

Charlotte, aged 14, was among the youngest guide dog owners. She had been gradually losing her eyesight since the age of eight, and lost her eyesight completely this year. She has been assisted by a two-year-old guide dog. Charlotte used to have a long stick to help her move around, but having a guide dog allows her much more freedom and makes her feel safer.

However, the association says there is a worryingly patchy supply of services for the young blind people across the UK, and it calls for national standards to be introduced. As with adult blind people, only a small number of them are likely to be considered suitable for a guide dog. Most will continue to rely on extra help and training from education and social services.

小题1:We can learn from the text that owning guide dogs     .

A．may meet with difficulties sometimes

B．is beneficial to blind children’s development

C．became possible in the UK recently

D．is quite universal in the UK小题2:According to the text, Charlotte’s example proves that     .

A．it is necessary to carry out the experimental project

B．guide dogs can get along well with disabled people

C．the association’s opinion is not quite right

D．youngsters need companions and friends小题3:What does the underlined word “patchy” in the last paragraph probably mean?

A．Endless.

B．Perfect.

C．Inadequate.

D．Diverse.小题4:What is the main idea of the text?

A．Blind people need guide dogs’ assistance in their daily life.

B．Age limit for the blind to have guide dogs is to be removed.

C．More guide dogs will be trained in the UK.

D．The project of using guide dogs is to begin.

与房地产交易相关，但不是房地产经纪人必须掌握的操作是( )。

A．广告发布

B．银行按揭

C．产权登记

D．贷款评估

从1930年到1931年，红一方面军在三次反“围剿”斗争胜利的基础上开辟了( )

A．鄂豫皖革命根据地
B．左右江革命根据地
C．湘鄂西革命根据地
D．中央革命根据地