______(我刚刚到家) than the telephone rang.

A．It reserves the right to refuse payment if a task is not completed satisfactorily.
B．It relies on legal or medical advice from an unknown online source.
C．It registers complaints about the advice offered on the site.
D．It reviews the companies that solicit and pay for tasks.

A．the Apollo mission was very successful
B．protection from space radiation is no easy job
C．astronauts will have deformed children or grandchildren
D．radiation is not a threat to well-protected space explorers