题干

若的最小值为,其图像相邻最高点
与最低点横坐标之差为,又图像过点,则其解析式是( )

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2013-05-08 03:40:47

答案(点此获取答案解析)

A

同类题2

阅读下列短文,从每题所给的四个选项(A、B、C和D)中选出最佳选项。

C

    Class Afloat is a Canadian school on a tall ship! The ship is 210 feet long and 30 feet wide, and it can take up to sixty students . The classrooms are well-equipped and comfortable, and there's even a library! It isn't necessary to know anything about sailing----students can learn on the ship.

    Not all the students are Canadian. There's usually a mix of nationalities. This year, there are also students from Mexico, the US, Germany, and Turkey. There's a mix of ages too. There are high school students sixteen to eighteen years old, and first-year college students.

    The teachers design special study programs for each student. Because the school is a ship, you can do some exciting classes,for example, Marine Biology (studying the animals and plants in the sea) and History of Geography courses about the places you visit. Students also learn all about sailing!

    Students don't just study. They must also clean, cook and sail the ship. In their free time, students can rest, read, or watch a movie. In the evening, they relax with friends and have club meetings.

    Every sixteen to twenty days, the ship stops in a port for three to six days. In port there's lots for the students to do-- homestays, camping trips, museum tours, cultural events, hiking, etc. They also go boating and do other water sports. Parents can meet up with the students in one port every term.

    Students also take part in two volunteer programs in Senegal and the Dominican Republic. They help local families in different ways, for example, with basic health matters or starting a business. Students learn how, with just a little money and time, they can make changes that improve other people's lives.

同类题3

                                                                          Section A (10 marks)

          Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage. Write NO MORE THAN THREE WORDS for each answer.

                          Not all print dictionaries are the same, as you will notice when you select one. To make a wise selection, you should know how to distinguish 

among three kinds of print dictionaries: pocket, desk, and unabridged. You should also know the copyright date of your dictionary, and

 check is special features.

          A pocket dictionary is small. Generally, it contains no more than 75000 entries, making it hardly to carry to class and efficient to use. 

However, a pocket dictionary doesn't contain enough entries to be adequate for college reference homework. In addition, the information 

about each word in a pocket dictionary is generally limited. A desk dictionary is medium sized, generally containing over 100,000 entries

 as well as extra features. For college work, you should own a current desk dictionary. An unabridged dictionary is a complete dictionary. 

Abridged dictionaries, such as pocket and desk dictionaries, are shortened. Because unabridged dictionaries contain nearly all English words,

 they are large and heavy. They are often used by schools and libraries.

           If the copyright date of your current dictionary shows that it was published five or more years ago, consider investing in a more recent 

edition. English is a dynamic language that admits new words and recognizes changes in meaning, spelling, and usage of familiar words.

 This is reflected in an up-to-date dictionary.

         In selecting a dictionary, check the features it offers besides vocabulary definitions. Many editions contain signs, symbols and foreign words.

 Some also contain CD-ROMs and access to special online features.

根据内容,在对应的空格写上正确的答案!

1、____2、 ____3、 ____4、 ____5、 ____ 

6、____7、 ____8、____9、 ____10、 ____