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Oil Reserve in West Asia
The world’s_________ oil reserve is in _____ ______. How big is the oil reserve there? _________ ____ a 2001 report, proven oil reserve is 93.9 _______ tons, which is ________ of the world’s total oil reserve.
In past ________ periods, the ocean in West Asia _____ _____ to land. Remnants of sea creatures that ______ under the sea for ____ _____ ______ ____ years deposited and finally _____ ____ oil and natural gas. Saudi Arabia has the largest oil reserve, _____ ______ 35.5 billion tons. Iraq’s oil reserve is 5.6 billion tons, _____ ______ ______ in the world.
In 1979, Iraq was ____ _______ _______ oil producer and exporter in the Middle East. It is _____ ____ ____ Saudi Arabia. ____ ____ _____ , Iraq could produce 170 million tons of oil every year. Iraq got ___ ______ ______ ____ money from oil. The Iraqi people’s life was quite good at that time. Now the wars _____ ______ _______.
Today, oil is _____ ____ ________ ______ in the world’s economy. There is a popular ______ : “If you control oil fields in the Middle East, you control _______ _______ ______. If you control the Middle East, you control the world’s ________ .” Thus, several big powers are _________ in the Middle East _____ oil.
The United State’s need for oil ______ 30 million tons every year. So it _____ ___ ________ ________ in the Middle East oil fields. According to the _______ investigation, Iraq’s oil reserve is larger than _____ _____ Saudi Arabia. If it is true, Iraq _____ _____ _____ in the world ____ ______ _____ oil reserve.
The Magic of Sound
Music is beautiful. In movies and plays, music has ___ _____ _______. It moves people, and sometimes it _______ people. Our ears can withstand sound ______ 20 ____ 80 decibels. What will happen if sound levels of music exceed that limit? If played ____ _____ ______, even beautiful music will become noise and _____ ______ , ____ ______ deafening noise.
We can do an experiment ____ the effect of high levels of sound in a lab. A strong blast of high sound can _____ or _____ even an iron sheet and a guinea pig will die if it stays in a _________ room ____ ______ ________.
The noise from a plane ______ 140 decibels _______ the sound of a violin is ____ _____ a few decibels. Therefore, ______ _______ can’t harm your health. If a person works in a _______ environment for a long time, his or her heart can _____ ______ , let alone his or her ________.
____ _______, some sounds are ______ our hearing. When sound exceeds 20,000 hertz, it is called ultrasonic, ______ we humans cannot hear. Dolphins, whales and bats can ______ ultrasonic waves, ______ do no harm to our health. In nature there is one more kind of sound waves humans cannot hear _____. These sound waves are called _____ ______ When we move, the air will vibrate. The _______ of air can produce infrasonic waves. Are infrasonic waves harmful? It _______. If its intensity is very ______, it won’t damage a person’s health. If its intensity exceeds 160 decibels, it’s ______. When wind blows ____ ____ _____ ____3 or 4 over the sea, it will produce infrasonic waves of several decibels. Only ________ can produce infrasonic waves of over 100 decibels.
The world’s_________ oil reserve is in _____ ______. How big is the oil reserve there? _________ ____ a 2001 report, proven oil reserve is 93.9 _______ tons, which is ________ of the world’s total oil reserve.
In past ________ periods, the ocean in West Asia _____ _____ to land. Remnants of sea creatures that ______ under the sea for ____ _____ ______ ____ years deposited and finally _____ ____ oil and natural gas. Saudi Arabia has the largest oil reserve, _____ ______ 35.5 billion tons. Iraq’s oil reserve is 5.6 billion tons, _____ ______ ______ in the world.
In 1979, Iraq was ____ _______ _______ oil producer and exporter in the Middle East. It is _____ ____ ____ Saudi Arabia. ____ ____ _____ , Iraq could produce 170 million tons of oil every year. Iraq got ___ ______ ______ ____ money from oil. The Iraqi people’s life was quite good at that time. Now the wars _____ ______ _______.
Today, oil is _____ ____ ________ ______ in the world’s economy. There is a popular ______ : “If you control oil fields in the Middle East, you control _______ _______ ______. If you control the Middle East, you control the world’s ________ .” Thus, several big powers are _________ in the Middle East _____ oil.
The United State’s need for oil ______ 30 million tons every year. So it _____ ___ ________ ________ in the Middle East oil fields. According to the _______ investigation, Iraq’s oil reserve is larger than _____ _____ Saudi Arabia. If it is true, Iraq _____ _____ _____ in the world ____ ______ _____ oil reserve.
The Magic of Sound
Music is beautiful. In movies and plays, music has ___ _____ _______. It moves people, and sometimes it _______ people. Our ears can withstand sound ______ 20 ____ 80 decibels. What will happen if sound levels of music exceed that limit? If played ____ _____ ______, even beautiful music will become noise and _____ ______ , ____ ______ deafening noise.
We can do an experiment ____ the effect of high levels of sound in a lab. A strong blast of high sound can _____ or _____ even an iron sheet and a guinea pig will die if it stays in a _________ room ____ ______ ________.
The noise from a plane ______ 140 decibels _______ the sound of a violin is ____ _____ a few decibels. Therefore, ______ _______ can’t harm your health. If a person works in a _______ environment for a long time, his or her heart can _____ ______ , let alone his or her ________.
____ _______, some sounds are ______ our hearing. When sound exceeds 20,000 hertz, it is called ultrasonic, ______ we humans cannot hear. Dolphins, whales and bats can ______ ultrasonic waves, ______ do no harm to our health. In nature there is one more kind of sound waves humans cannot hear _____. These sound waves are called _____ ______ When we move, the air will vibrate. The _______ of air can produce infrasonic waves. Are infrasonic waves harmful? It _______. If its intensity is very ______, it won’t damage a person’s health. If its intensity exceeds 160 decibels, it’s ______. When wind blows ____ ____ _____ ____3 or 4 over the sea, it will produce infrasonic waves of several decibels. Only ________ can produce infrasonic waves of over 100 decibels.
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