单项选择题

This (equipment) is (based upon) advanced (techniques) and it is (highly reliable).

A．equipment
B．based upon
C．techniques
D．highly reliable
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单项选择题
(Despite) his old (age), he is still (very) (healthful) and often works in the field.
A．Despite
B．age
C．very
D．healthful
单项选择题
(Every now and then) he (would) come here (paying a visit to) his old aunt, who lived (all alone) in a small house.
A．Every now and then
B．would
C．paying a visit to
D．all alone
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