thE sEntEnCE in thE ninth pArAgrAph, "rEsEArChErs ArE not likEly to hAvE Anything rEsEmBling A BlooD tEst For A mEntAl illnEss soon"mEAns thAt_____.
A．mEntAl illnEss CAn not BE DiAgnosED By BlooD tEst.
B．thErE is not A DEFinitE CritErion For mEntAl illnEss.
C．rEsEArChErs Do not likE to usE BlooD tEst.
D．tEChniquEs hAvE gAinED Enough progrEss But ArE still not Enough For mEntAl illnEss.