Urban renewal programs strive to upgrade areas that are becoming slums.
A、reproachB
暂无解析
Insectpestsareamongtheleadingcausesofcropfailure.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.
The Salk vaccine is a major factor in the fight to eradicate polio.
One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.
