单项选择题

COBRA ensures an ex-employee stay in the health care plan ______.

A．as long as the ex-employer continues to pay the premium
B．as long as the ex-employee continues to pay the premium
C．as long as the ex-employee finds a new job
D．as soon as the ex-employee is called back to the company
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单项选择题
Which of the following is the function that nanoscale motors perform
A．rearranging individual atoms
B．manipulating individual atoms
C．producing products and process
D．photosynthesis and muscle concentration
单项选择题
According to the passage, all of the following statements are true EXCEPT ______.
A．The two strands making up DNA's double helix can find each other easily in a complex chemical mixture
B．Evolution has solved the problem of building a computer smaller than a speck of dust a long time before
C．DNA not only programs cells to replicate themselves but also instructs them how to assemble individual molecules into new materials
D．The read-head components for computer hard drives are constructed by means of the technology known as a molecular beam epitaxy
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