单项选择题

It can be inferred from the passage that on other planets

A．there is no oxygen for creating life
B．there is no suitable temperature for creating life
C．living things of different kinds may exist
D．living things similar to that on earth may exist

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热门试题

单项选择题

Scientists cannot create actual life in laboratory because ___________.

A．they can't complete endless biochemical reactions
B．they can't have the same conditions that nature has
C．they lack of millions and millions years of time
D．they lack of enough nucleic acid molecules

单项选择题

According to the scientists, life came from ___________.

A．combination of energy and biochemical materials
B．combination of nucleic acid and amino molecules
C．nucleic acid molecules
D．amino acid molecules