If someone has an accident and can no longer walk, scientists might be able to use stem cells to ___ the damaged cells and allow that person to walk again.
| A．rescue | B．remove | C．reserve | D．replace |
相关试题
．Jenny was looking for a seat when，luckily，a man____________and left．
| A．took up | B．got up | C．shut up | D．set up |
Some people eat with their eyes. They prefer to order whatnice.
| A． | looks | B． | smells | C． | feels | D． | tastes |
Tired, Jim was fast asleep with his back_____a big tree.
| A．in | B．below | C．beside | D．against |
A great number of students____________ said they were forced to practise the piano.
| A．to question | B．to be questioned | C．questioned | D．questioning |
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