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 D

Đọc 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 of the Moon. This momentous trip for humanity also provided scientists with

an abudance of material for study; from rock and soil 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 from larger rocks when meteors impacted with the surface of the Moon. The bits of

glass are spherical in shape and constitute approximately 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 and breccia . Basalt is a cooled and hardened volcanic lava common to the Earth.

Since basalt is formed under extremely high temperatures, 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 surface of the

Moon. This second type of rock consists of small pieces of rock compressed together bythe force of

impact. Gases such as hydrogen and helium were found in some of the rocks, and scientists believe

that these gas were carried to the Moon by the solar wind, the streams of gases that are constantly

emitted by the Sun.