— Hello, Paul, do you like to join us in playing football? We need one more person to ____ a team.

— Yes, I’d like to.

A．pick up

B．pick out

C．make up

D．make out

凡能引起物质电离的各种辐射称为电离辐射。如各种天然放射性核素和人工放射性核素、X线机等。