Scientistshaveobtainedmoreevidence___________plasticisfindingitswayintothehumanbody.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
---Areyoustillmadather?
---Notreally,butIcan’t______thatherremarkshurtme.
Motorists_____ofspeedingmaybebannedfromdrivingforayear.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
