1. Assessment: What is the overall main idea of the article "What is a
Spacewalk?"
OA. Astronauts carefully leave their spacecraft to do experiments and
make repairs.
OB. Astronauts walk inside their spacecraft to collect things to bring
back to earth.
OC. Astronauts stay inside their spacecraft because being outside is
dangerous.
OD. Astronauts quickly exit their spacecraft so they do not get the
"bends."