Bronze, after being heated by a strong flame, will change color, especially when exposure to hydrogen.

Câu hỏi liên quan

• While the sun is the major source of ultraviolet rays, it is not the source only.

• Find the ONE among the underlined and marked A, B, C, D in each of the following sentences that needs correcting:

  Jack had to skip breakfast; otherwise, he will be late for class.

• Choose the letter A, B, C or D to complete the sentences

  I didn't get much of an _______ of the place because it was dark when we drove through it

ZUNIA12

• Air pollution, together with littering, are causing many problems in our large, industrial cities today.

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  __________ the church service, people keep quiet.

• Southern California, is known for its mild winters, has become the new home for many senior citizens escaping the hard Northern winters.

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  You should bring an umbrella__________ it rains

• Choose the best answer A, B, C or D for the sentence: "I’m sure you understand that the ________ just ended is the time for the terminal exams."

• Jim didn’t have a house and a car, for he was jobless for a long time

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  . It was too late__________.

• The first things a new international student must do include renting an apartment, registering for classes, and to get to know the city.

• Friends advise her to stop doing the housework because her old age.

• Nutritionists recommend that foods from each of the four basic groups be eaten on a regularly daily basis.

• I really hope my sister will apply for that new job; she will be so good with it.

• Geologists find it useful to identification fossils in a rock sample because certain assemblages of species are characteristic of specific geologic time periods.

• Choose the best answer: 
  Due to a lack of rainfall, California regularly has............ in summertime.

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  My car broke down on the way. ________, when I got to the airport the plane had taken off .

• I would be happy to see him, but I didn’t have time because of the coming examinations

• Medical research indicates that large amounts of Histamines can responsible for cold, high fever, and other respiratory reactions.

• Drying food by means of solar energy is a ancient process applied wherever food and climatic conditions make it possible