(토플) The nucleus is composed of particles called nucleons, which when electrically charged are protons and (_____) are neutrons.
1) when electrically neutral
2) electrically neutral
3) electrical and neutral
4) when it is electrically neutral
(토플) John F. Kennedy was only forty-two when he was inaugurated as president of the United State - the youngest person (_____) the presidency.
1) ever electing to
2) ever been elected to
3) who ever elected to
4) ever elected to
(토플) The earliest primates were tree-dwelling squirrel-like animals that (_____) modern primate species.
1) bore little resemblance to
2) were boring resemblance little to
3) was bearing little resemblance to
4) little bored resemblance to
