In the sixteenth century, Francois Vieta, a French mathematician, used the vowels “a”, “b”, “c”, “d”, “u” to represent a unknown number.

Câu hỏi liên quan

• Unlike magazines, Internet posts or e-Mails that might contain small ____________  of information.

• Abigail Adam’s letters to her husband present a graphic picture of the age which she lived.

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

  This is the girl for which I am waiting.

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• It is difficult to get used to sleep in a tent after having a soft comfortable bed to lie on.

• What a(n) __ thing to say! what gave you that idea?

   

• The number of student attending English courses at our university are increasing.

• The federal government recommends that all expectant women will not only refrain from smoking but also avoid places where other people smoke

• I have nearly finished reading the book. There are only a few ______ left.

• Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

  A. Speechless     B. Worthy     C. Pollute     D. Borrow

• Denish decided not to ____ the exam in December.

• Only when black bear has been spotted by the forest rangers will this portion of the park be closed down.

• It is large island, few people live there, though.

• Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

   A. Familiar     B. Uncertain     C. Global     D. Impatient

• The teacher taught her students to look careful to the left and the right at least three times before crossing the highway.

• It was her who suggested that he should go to New York in order to get  a direct flight.

• By the end of the month, I’ll be working for this firm for a year.

• The sun contains 99.9 percentage of the mass of the solar system.

• Chọn đáp án đúng để hoàn thành các câu sau:

  I had my hair________by my brother.

• People who exercise regularly are less likely to develop heart disease than is those who do keep fit.

• Identify the error in each sentence: Sydney Laniar achieved fame both as a poet or a symphony musician