Đọc kỹ đoạn văn sau và điền A, B, C hoặc D vào chỗ trống tương ứng với phương án lựa chọn đúng.
Throughout history, people who lived near volcanoes made up stories to explain why they erupt. Usually they believed that the gods were showing their (1) through the eruption. Today scientists can explain much about volcanoes, but they also must guess about what is happening deep inside the earth. There is still (2) for us to learn. The active volcanoes of the world exist in definite patterns. They are not just scattered anywhere, but they are found in chains and groups. Three-quarters of the earth’s (3) are in the Ring of fire around the Pacific Ocean. There is another chain in Atlantic, a chain in the Mediterranean and a group in Central Africa. Most of them are on coastline or islands. Much of the material under the surface of the earth is melted rock (4) called magma. The magma escapes sideways or upward until it starts to push on the underside of the earth’s surface. If there is a weak spot, the magma and its gasses push right through the spot and explode into the air. If there is a lot of gas, the (5) is violent. If there is only (6) gas, the eruption is mild. The hole which forms at the top of the volcano is called a crater. After the magma escapes to the earth’s (7) , it is called lava. (8) are observing volcanoes throughout the world. They hope that by (9) the history of eruption and the changes in a volcano before eruption, they will be able to tell (10) one is going to happen. Humans have learned to control many things about nature, but we cannot control volcanoes. However, if we can know that an eruption is going to happen, many lives can be saved
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