第一节 共15小题；每小题2分，满分30分）
阅读下面短文，从短文后所给各题的四个选项（a、b、c、d）中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。
one morning i wasted nearly an hour watching a tiny ant carry a huge feather. several times，it __1__ several obstacles in its path. and after a momentary pause it would make the necessary detour. at one point, the ant had to cross a crack about 10 mm wide. after some __2__ thoughts，the ant laid the feather over the crack，walked across it and picked the feather up on the other side，then continued on its way. i was __3__ by the cleverness of this ant. it was only a small insect，lacking __4__ yet ___5____with a brain to reason，explore, discover and overcome. but this ant, like the other twolegged creatures __6__ on the earth, also shares human failings.
after some time the ant finally reached its destination—a flowe
