Insectpestsareamongtheleadingcausesofcropfailure.
A、expectedAlligators still exist in some of the dank 潮湿 swamps and bayous小海湾 of Alabama's coastal regions.
The future survival of the bald eagle is still an important American ecological concern.
Urban renewal programs strive to upgrade areas that are becoming slums.
TheeconomyofDallas,Texas,isstronganddiversified.
In 1861 it seemed inevitable that the Southern states would break away from the Union.
