单项选择题

What do we learn from the passage about solar wind activity （）

A. It affects the growth of trees.
B. It has been increasing since the Ice Age.
C. It is determined by the chemicals in the air.
D. It follows a certain cycle.

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单项选择题

The underlined word “penalty” is closest in meaning to（）.

A. punishment
B. trial
C. accusation
D. execution

问答题

他工作表现出色，最近被提升为部门经理。