A．Steve is worried about his illness because he has to do a presentation on Friday.
B．Carla's mother is really keen on modem medicine.
C．Carla favors herbal medicine.
D．Carla suggests that Steve drink her mother's herbal tea three times a day after meal.
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A．Talk to another friend.
B．Take Carla's suggestion.
C．See the same doctor again.
D．Stay in bed until Friday.
A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.