Which bird can fly _______(high)?用higher 还是highest

Which bird can fly _______(high)?用higher 还是highest which bird can't fly? 英文IQ题：which bird can't fly? A bird is an animal which can fly . Bird can fly Which is the (higher,highest)____mountain in the world. 鸟能飞多高是how high can brids fly还是how height can birds fly? can bird fly?用yes.回答怎么回答? Which letter can fly? Which letter can fly some bird can fly,----------can‘t.空格处应该填 some还是any? A bird can fly.(改为否定句)