This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?
| A．a | B．an | C．the | D．/ |
Thedays last too long. We hate them.
A. fog B. foggy C. fogy
I love the schoolI have studied in for three years.
A. where B. when C. that
—Look at these stamps. Ithem for five years.
—Wow, they are wonderful.
A. kept B. have kept C. have bought
Teenagersallowed to drive .
A. should not be B. should be not C. not should be
My parents asked mecomputer games.
A. not playing B. not to play C. not play