【题目】已知函数f（x）＝3x1，x∈{x∈N|1≤x≤4}，则函数f（x）的值域为______________．

【题目】下列四个说法：

①若定义域和对应关系确定，则值域也就确定了；

②若函数的值域只含有一个元素，则定义域也只含有一个元素；

③若f（x）＝5（x∈R），则f（π）＝5一定成立；

④函数就是两个集合之间的对应关系．

其中正确说法的个数为（ ）

A．1 B．2 C．3 D．4

【题目】若一系列函数的解析式相同，值域相同，但定义域不同，则称这些函数为“孪生函数”，那么函数解析式为y＝2x2－3，值域为{1，5}的“孪生函数”共有（ ）

A．10个 B．9个 C．8个 D．4个

【题目】

I’m so glad you’ve come here to this matter in person. (2012 湖北)

A. lead to

B. see to

C. turn to

D. refer to

【题目】

When the old man to walk back to his house, the sun itself behind the mountain.

A. started; had already hidden

B. had started; had already hidden

C. had started; was hiding

D. was starting; hid

【题目】设集合P＝{x| x2－2x＝0 }，Q＝{x| x2＋2x＝0 }，则P∪Q＝_______．

【题目】设全集I＝{x||x|＜4且x∈Z}，S＝{－2,1,3}，若IPS，则这样的集合P共有________个．

【题目】Dear Liz,

My stay in Thailand has certainly been the experience of my life.

Life is busy and exciting. Bangkok is just like any other big city with a population of 10 million and heavy traffic. I’m very lucky because my host family is in a nice quiet area outside the city. There are Mr. and Mrs. Phairat, their son Sanan, who is 18, the daughter Chinda, who is 16, and Grandpa and Grandma.

I go to an international school with Sanan and Chinda. The school teaches about 70 percent in English, and 30 percent in Thai. I've learned some spoken language, but Thai writing is very difficult, The cooking lesson is my favourite. I'm learning all about Thai food and culture People don’t use chopsticks here, but spoons and forks. When I come back, I'm going to cook you a real Thai meal.

Last weekend we visited some temples. We also drove to Pattaya beach near Bangkok. I thought it was great, but Sanan and Chinda say that next month they’re taking me to Phuket Island, where the beaches are even more beautiful. The month after next, we’re going to travel to Mr. Phairat’s hometown in the north of Thailand. The Phairat’s own land there, and they have two elephants. I’m going to ride those elephants — and even wash them. Sanan and Chinda say it’s really fun.

I'm amazed by everything in this country, especially by the elephants. Elephants are an important part of Thai culture and way of life. They have been a traditional symbol of Thailand for many years in times of war and peace. In the seventh century, a Thai king trained 20, 000 elephants for battle.

I’ll tell you all about my Thai boxing lessons next time I write.

Love,

Mandy

【1】 How many family members are there in Mandy’s host family?

A. 4

B. 5

C. 6

D. 7

【2】 Next month, Mandy is going to visit__________.

A. Pattaya beach

B. Phuket Island

C. Phairat’s hometown

D. Bangkok

【3】 From the letter we know that Mandy is__________ when she stays in Thailand.

A. bored

B. quiet

C. excited

D. proud

【4】 What is the letter mainly about?

A. Study trip in Thailand

B. Food culture in Thailand

C. Elephant riding in Thailand

D. International schools in Thailand

【题目】

As many small cities grow rapidly, water has been polluted, which is a serious problem that people should pay more attention to.

A. a great many

B. a large number of

C. a large amount of

D. a great deal

【题目】

He football for many years before he was twenty.

A was playing

B. played

C. has played

D. had played