wE CAn inFEr From thE pAssAgE thAt sCiEntists ArE ______.
A．writing rEports
B．oBsErving whAt hAppEnED to sAn FrAnCisCo
C．proviDing morE inFormAtion ABout thE CAliForniA EArthquAkE
D．lEArning morE ABout EArthquAkEs