Gunpowder, in some ways the most effective of all the explosive materials, were a mixture of potassium nitrate, charcoal, and sulfur

Câu hỏi liên quan

• Most bats roost in crevices, caves, or building by day and are active at night or twilight.

• Choose the correct answer to complete the sentence. "Global warming occurs when the greenhouse gases in the atmosphere trapthe heat_______ the sun"

• There are many different ways of comparing the economy of one nation with those of another.

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• He had so a difficult exercise that he couldn’t do it .

• One of the four underlined parts marked A, B, C, D in each sentence is not correct in standard English. Identify them: 

  If he weren’t too old, he would apply to the job as a reporter. 

• Superior to all others woods for shipbuilding, teak is also used for furniture , flooring, and general construction.

• Since infection can cause both fever as well as pain, it is a good idea to check a patient’s temperature.

• Two unique features of the Arctic they are lack of precipitation and permanently frozen ground.

• Many birds will, in the normal course of their migrations, flying more than three thousand miles to reach their winter homes.

• Because there was no evidence against himself, Slade was released

• The main advertising media includes direct mails, radio, TVs, magazines, and newspaper

• The geology professor showed us a sample about volcanic rock which dated back seven hundred years.

• Neither of the two candidates who had applied for admission to the Industrial Engineering Department were eligible for admission.

• AIDS can be transmitted by practicing unsafe sex and receive tainted blood from one who is already infected.

• Choose the correct answer to complete the sentence. "Twenty per cent of all the birds in the world ______ in the rainforest"

• The most of the energy used in our homes and factories is generated from coal, oil and natural gas

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  UNESCO's World Heritage List can be seen as a celebration of both the _________  of nature and the greatness of culture.

• Time is of few count in relation to great thoughts that are as vivid today as when they first passed through the author’s minds ages ago

• Before television became so popular, Americans used to entertain each other in the evening by playing games, saying stories, and singing songs.

• Before she moved here, Arlene had been president of the organization since four years.