单项选择题

(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
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单项选择题
In the days when coal was so (widely) used, (no one) realized how soon and how (complete) oil would replace (it).
A．widely
B．no one
C．complete
D．it
单项选择题
(Even though) she looks very (young), she is (twice older than) my (twenty-year-old) sister.
A．Even though
B．young
C．twice older than
D．twenty-year-old
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