The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.
A、occurrenceD
暂无解析
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Foodmustbemoistinordertohaveataste.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
