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【多选题】
Which thoery is know as one of the three indispensable theories upon which the science of biology is built in 19th century?A.
The theory of evolution
B.
The cell theory
C.
The theory of equilibrium thermodynamics
D.
Mendal's law of inheritance
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皮皮学刷刷变学霸
举一反三
【单选题】Y ou look too tired. Why not______a rest?
A.
stop to have
B.
to stop having
C.
stop having
D.
to stop to have