某病人患肝硬化多年，近日因腹胀明显，给予腹腔穿刺放液。昨晚，患者突然出现睡眠障碍，意

已知函数f（x）=x²+2ax-4，a∈R．

（1）若f（x）为偶函数，求a的值；

（2）若f（x）在[1，+∞）上为增函数，求a的取值范围；

（3）f（x）在[1，2]内的最小值为g（a），求g（a）的函数表达式．

小敏在某次实验中需要10 mL、20 mL和40 mL三种不同体积的水。他手中有两只量筒，但大部分刻度已模糊不清，一支只能看清50 mL，另一支只能看清30 mL的刻度，他为获得不同体积的水，需要提取水的次数和倾倒水的次数分别至少为：    

(1)取10 mL时：提取_______次，倾倒_______次；    

(2)取20 mL时：提取_______次，倾倒_______次；    

(3)取40 mL时：提取_______次，倾倒_______次。

Reading comprehension.

     The elephant was lying heavily on its side, fast asleep. A few dogs started barking at it. The elephant woke

up in a terrible anger: it chased the dogs into the village where they ran for safety. That didn't stop the elephant.

It destroyed a dozen houses and injured several people. The villagers were scared and angry. Then someone

suggested calling Parbati, the elephant princess.

     Parbati Barua's father was a hunter of tigers and an elephant tamer. He taught Parbati to ride an elephant

before she could even walk. He also taught her the dangerous art of the elephant round-up-how to catch wild

elephants.

     Parbati hasn't always lived in the jungle. After a happy childhood hunting with her father, she was sent to

boarding school in the city. But Parbati never got used to being there and many years later she went back to

her old fife. "Life in the city is too dull. Catching elephants is an adventure and the excitement lasts for days

after the chase," she says.

     But Parbati doesn't catch elephants just for fun. "My work," she says, "is to rescue man from the elephants,

and to keep the elephants safe from man." And this is exactly what Parbati has been doing for many years.

Increasingly, the Indian elephant is angry: for many years, illegal hunters have attacked it and its home in the

jungle has been reduced to small pieces of land. It is now fighting back. Whenever wild elephants enter a tea

garden or a village, Parbati is called to guide the animals back to the jungle before they can kill.

     The work of an elephant tamer also involves love and devotion. A good elephant tamer will spend hours a

day singing love songs to a newly captured elephant. "Eventually they grow to love their tamers and never

forget them. They are also more loyal than humans," she said, as she climbed up one of her elephants and sat

on the giant, happy animal. An elephant princess indeed!

1. For Parbati, catching elephants is mainly to _____. [ ]

A. get long lasting excitement

B. keep both man and elephants safe

C. send them back to the jungle

D. make the angry elephants tame

2. Before Parbati studied in a boarding school, _____. [ ]

A. she spent her time hunting with her father

B. she learned how to sing love songs

C. she had already been called an elephant princess

D. she was taught how to hunt tigers

3. Indian elephants are getting increasingly angry and they revenge because _____. [ ]

A. they are caught and sent for heavy work

B. illegal hunters capture them and kill them

C. they are attacked and their land gets limited

D. dogs often bark at them and chase them

4. The passage starts with an elephant story in order to explain that in India _____. [ ]

A. people easily fall victim to elephants' attacks

B. the man-elephant relationship is getting worse

C. elephant tamers are in short supply

D. dogs are as powerful as elephants

冷却塔的主要参数是什么？

“一带一路”建设倡导文明宽容，尊重各国（）的选择，加强不同文明之间的对话，求同存异、兼容并蓄、和平共处、共生共荣。

A、政治制度

B、经济体制

C、发展道路和模式

D、经济发展道路