A.Most people
B.a living
C.goods and services
D.such things like
A.off
B.at
C.through
D.from
A.come
B.is coming
C.came
B、In vitro testing of biomaterials is done in the living tissue of a living organism.
C、The advantage of in vitro testing is that the experiment can be controlled easily and precisely.
D、In vivo tests include animal testing such as rat, pig, machin and clinical trials in humans.
A.menu
B.bill
C.water
D.dish
A.assistant manager
B.resident manager
C.boss
D.bellman
A.minutes’ walk
B.minute walk
C.minute’s on foot
D.minutes’ on foot
A.那些签名的人想去参观展览
B.参观展览的人喜欢在这儿签名
C.想去参观展览的人请在这儿签名