单项选择题

Why were cracks in old houses not a big concern

A．Because indoor cleanness was not emphasized.
B．Because energy used to be inexpensive.
C．Because environmental protection was given top priority.
D．Because they were technically unavoidabl

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单项选择题

Which of the following would be the best title for this passage______.

A．How to Avoid Hurricane Damage
B．Forecasting Hurricanes
C．The dangerous Hurricane
D．Atlantic Storms

单项选择题

The eye of the hurricane is______.

A．the powerful center of the storm
B．the part that determines its direction
C．the relatively calm center of the storm
D．the center of low pressure