Bacteria will not do harm unless they get into the human body.
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Some bacteria re pathogenic(致病的), _______means that they may cause disease after entering the body.
A. that
B. which
C. who
D. what
We report here a case in which the patient failed to respond to medical________.
A. interventions
B. interactions
C.interferes
D.interruptions
We put down a ______ on a house yesterday
A. certificate
B.receipt
C. recommendation
D. deposit
X-rays were discovered by a German scientist_________name was WilhemKonradRoentgen.
A. his
B.the
C. whose
D.her