单项选择题
A．a few B．a little C．little D．no
A．Food for astronauts must be made in a special way. B．All meat on earth comes in bite-sized pieces. C．Astronauts will only eat cakes made from crambs. D．Astronauts have to go hungry in a spaceship.
A．He introduced the 35 mm standard machine to the world. B．He introduced the 35 mm as the international standard film width. C．He created a 35 mm standard device for showing movies. D．He created his own standard devices for showing 35 mm film.