单项选择题

A．People will feel happy when daydreaming.
B．People should not daydream at any time.
C．Daydreaming does more good than harm for most people.
D．Hard work is the key to accomplishing goals.
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单项选择题
What do economists think about the damage brought by climate change（）

A．It reaches 2.5% of annual per capita income.
B．It is about 20% of the yearly global GDP.
C．They have overestimated the damage.
D．They haven’t reached a consensus.
单项选择题
Recurrence rates of earthquakes can help predict future quakes because ______.
A．the improvement in mathematics allows figures to be more accurate
B．this method has been used since ancient times and proved very effective
C．most scientists focus their investigations on the quakes of certain areas
D．continuous plate movements often result in earthquakes in certain areas
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