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【单选题】
---________? ----They’re fine, thanks.A.
Are they your grandparents
B.
Do you like your grandparents
C.
How are your grandparents
D.
Where are your grandparents
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【单选题】You will easily know ________ video recorders are the same.
A.
what those
B.
that of those
C.
that all of
D.
which of those
【单选题】Those of us who work in chemical laboratories，should have their lungs checked quite regularly.
A.
Those of us
B.
laboratories
C.
their
D.
checked