In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous.
In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous.
The features of volcanoes are much more complicated and their structure and behavior depend on the following factors EXCEPT ______.
The features of volcanoes are much more complicated and their structure and behavior depend on the following factors EXCEPT ______.
The great size of the volcanoes and the ______ of their lava flows is considered an indication that the crust of Mars is fixed. A: explosion B: exploit C: extent D: exposure
The great size of the volcanoes and the ______ of their lava flows is considered an indication that the crust of Mars is fixed. A: explosion B: exploit C: extent D: exposure
In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous. A: evaluating B: examining C: ejecting D: equipping
In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous. A: evaluating B: examining C: ejecting D: equipping
There could be life on the Mars in the future if（） A: it supported life in the past B: certain gases are used to cool the planet C: the atmosphere can be heated enough to grow simple plants D: the planet’s volcanoes become as active as they were in the past
There could be life on the Mars in the future if（） A: it supported life in the past B: certain gases are used to cool the planet C: the atmosphere can be heated enough to grow simple plants D: the planet’s volcanoes become as active as they were in the past
How did “columnar joints” come into being? A: The magma condensed into stone columns. B: The pumice stones piles layer by layer. C: The volcanoes look like columnar joints. D: Creatures were gradually fossilized and they slowly turned into a thick limestone layer on the seabed
How did “columnar joints” come into being? A: The magma condensed into stone columns. B: The pumice stones piles layer by layer. C: The volcanoes look like columnar joints. D: Creatures were gradually fossilized and they slowly turned into a thick limestone layer on the seabed
中国大学MOOC: Thefollowing sentences are from one paragraph. Decide which one is the topic sentence of the paragraph?1)In time, this melted part rises as a magma.2)The formation of a volcanic eruption is a dramatic series of events.3)As the plate sinks, friction and the earth’s heat cause part of it to melt.4)The magma produces heat, steam, and pressure.5)First of all, most volcanoes are formed where two plates collide.6)Then one of the plates is forced under the other and sinks.7)When the heat, steam, and pressure from the magma finally reach the of the Earth, volcanic eruption occurs.
中国大学MOOC: Thefollowing sentences are from one paragraph. Decide which one is the topic sentence of the paragraph?1)In time, this melted part rises as a magma.2)The formation of a volcanic eruption is a dramatic series of events.3)As the plate sinks, friction and the earth’s heat cause part of it to melt.4)The magma produces heat, steam, and pressure.5)First of all, most volcanoes are formed where two plates collide.6)Then one of the plates is forced under the other and sinks.7)When the heat, steam, and pressure from the magma finally reach the of the Earth, volcanic eruption occurs.