单项选择题

A．A person needs to go back home frequently.
B．A person needs adjustment in a new environment.
C．A person needs to experience some frustration.
D．A person needs to depend on others.
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单项选择题
A．They can be built to be very light.B．They are inexpensive to operate.C．They can be directed by remote control.D．They easily connect distant points.
A．They can be built to be very light.
B．They are inexpensive to operate.
C．They can be directed by remote control.
D．They easily connect distant points.
单项选择题
A．Why fog freezes at low temperatures.B．How very small droplets can form.C．Why the density of fog varies.D．How water droplets stay suspended in air.
A．Why fog freezes at low temperatures.
B．How very small droplets can form.
C．Why the density of fog varies.
D．How water droplets stay suspended in air.
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