7 . 语法填空
The first creature 1 (orbit) our planet was just 2 years old. Her name was Laika. She was a good dog. Her 1957 flight paved the way for space 2 (explore) when scientists wondered 3 it was lethal (致命的) for living things.
Humans are born explorers. Since the dawn of civilization, we 4 (attract) over the horizon to find food or more space, or just to see what’s beyond those trees, mountains or oceans. Our ability to explore has reached new heights. Airplanes could shorten distances, simplify travel and show us Earth from 5 new aspect. By the middle of the last century, we aimed even 6 (high).
Our first steps into space began. Laika was followed into orbit four years later 7 the first human, Yuri Gagarin. Space travel is nothing like that in the movies. Getting from A to B requires complex calculations 8 (involve) inertia (惯性) and gravity. Space is also dangerous. More than 20 astronauts have died while doing 9 (they) jobs.
That hasn’t stopped people from signing up and blasting off (发射升空). NASA’s Apollo programme has ended but private companies are readying their own space programmes. A company 10 (name) Space X is hoping to land civilian astronauts on Mars. Maybe you’ll be a member of them. Don’t forget to bring your dog.
