Although Yuri Gagarin first space flight lasted only 108 minutes, it gave encouragement to those who were interested in the future of manned space flight
Chọn đáp án A
If they ______ down that old opera house, we would not have any historical architecture left in the city.
In recent years, there have been great increases in a number of engineers and scientists employed in American industries.
Physical fitness does not guarantee good health, but they provide a big step toward living a long and healthy life.
Plants and animals require water that are moderately pure, and they cannot survive if water is loaded with toxic chemicals.
Water pollution can kill a large number of fish, birds, but other animals; in some cases it may kill all members of a species in an affected area.
One step beyond automated machines is the industrial robot, the heart and brain of that is the microcomputer.
The volunteers collect tortoise eggs ______ tortoises form being extinct.
Experts in psychology believe that for many people money is an importance symbol of strength and influence.