ⅰ.单词拼写 1．a line of forts was built along the border to ________(保护)the country against attack. 2．the location of the new house is ________(理想的)． 3．that mistake seriously ________(危及)the future of the company. 4．there is always beautiful scenery in nature ________(保护区)． 5．if we don't protect this kind of animals，they will be
