THE BOOKS FOR MY ENGINEERING COURSE ARE MORE EXPENSIVE THAN MY OTHER...

Câu 15: The books for my engineering course are more expensive than my other courses. A B C DĐọc kỹ đoạn văn và chọn phương án đúng (A, B, C hoặc D)cho mỗi chỗ trống:Just two months after the flight of Apollo 10, the Apollo 11 astronauts made their historic landing on the surface ofthe Moon. This momentous trip for humanity also provided scientists with an abudance of material for study; from rock andsoil samples brought back from the Moon, scientists have been able to determine much about the composition of the Moon(as well as to draw) inferences about the development of the Moon from its composition.The Moon soil that came back on Apollo 11 contains small bits of rock and glass which were probably ground fromlarger rocks when meteors impacted with the surface of the Moon. The bits of glass are spherical in shape and constituteapproximately half of the Moon soil. Scientists found no trace of animal or plant life in this soil.In addition to the Moon soil, astronauts gather two basic types of rocks from the surface of the Moon: Basalt andbreccia . Basalt is a cooled and hardened volcanic lava common to the Earth. Since basalt is formed under extremely hightemperatures, the presence of this type of rock is an indication that the temperature of the Moon was once extremely hot.Breccia, the other kind of rock brought back by the astronauts, was formed during the impact of falling objects on the surfaceof the Moon. This second type of rock consists of small pieces of rock compressed together bythe force of impact. Gasessuch as hydrogen and helium were found in some of the rocks, and scientists believe that these gas were carried to the Moonby the solar wind, the streams of gases that are constantly emitted by the Sun.