单项选择题

What is the woman's project mainly about

A．How hydrothermal vents are formed.
B．How living things get energy from sunlight.
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.

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单项选择题

How do weather forecasters identify hurricanes

A．By name.
B．By number.
C．By location.
D．By mont

单项选择题

How is one tropical weather system distinguished from the other

A．Wind speed.
B．Rainfall.
C．Water temperature.
D．Direction of approac