单项选择题

A worldwide ______to healthier diets is one of many actions that need to be taken to avoid dangerous climate change.

A．shift
B．admission
C．witness
D．response
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单项选择题
Traditional exercises like sit-ups, press-ups and pull-ups are great for strengthening the body, ______you do them properly.
A．since
B．unless
C．providing
D．considering
单项选择题
How much did you______on this new car
A．cost
B．pay
C．spend
D．take
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