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化学品氧化通常使用的是盐酸和硫酸混合液法。( )
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You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. Questions 11—13 are based on the following conversation. What are the students doing when the man arrives in class
Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are three parts in this section, Part A, Part B and Part C. Remember, while you are doing the test, you should first put down your answers in your test booklet, NOT on the ANSWER SHEET. At the end of the listening comprehension section, you will have 5 minutes to transfer your answers from your test booklet onto ANSWER SHEET 1. If you have any questions, you may raise your hand NOW as you will not be allowed to speak once the test is started. Now look at Part A in your test booklet.Part A You will hear a talk. As you listen, answer questions 1—10 by circling True or False. You will hear the talk ONLY ONCE. Galileo believed that continuous force was needed to keep an object moving at a steady speed.
You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right. You will hear the talk TWICE. What were the market centers used for
Text 2 A very important world problem — in fact, I think it may be the most important of all the great world problems which face us at the present time — is the rapidly increasing pressure of population on the land. The population of the world today is about 4,000,000,000. That is an enormous number, yet it is known quite accurately, because there are very few parts of the world which have not carried out a modem census. The important thing is not so much the actual population of twenty million — about six months’ increase in world population. Take Australia for example, there are ten million people in Australia. So it takes the world about three months to add to itself a population which peoples that vast country. Let us take our own crowded country, England and Wales — forty-five to fifty million people. This is just about a year’s supply. By this time tomorrow, and every day, there will be added to the earth about 120,000 extra people — just about the population of the city of York. I am not talking about birth rate. This is net increase. To give you some idea of birth rate, look at the second hand of your watch. Every second, three babies are born somewhere in the world. Another baby! Another baby! You cannot speak quickly enough to keep up with the birth rate. This enormous increase of population will create immense problems. By AD2000, unless something terrible happens, there will be as many as 7,000,000,000 people on the surface of the Earth! So this is a problem which you are going to see in your lifetime. In the last paragraph, what does the author probably imply by "something terrible"
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