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A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.
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单项选择题A．Why white pepper is superior to dishes.B．How different kinds of pepper are produced. C) How the pepper plant is grown.C．How various peppers are used in cooking.

A．Why white pepper is superior to dishes.
B．How different kinds of pepper are produced. C) How the pepper plant is grown.
C．How various peppers are used in cooking.

单项选择题A．Because many people don’t know how to behave in social situations.B．Because most people are shy by nature.C．Nobody will laugh at you for being shy.D．Shyness is difficult to overcome.

A．Because many people don’t know how to behave in social situations.
B．Because most people are shy by nature.
C．Nobody will laugh at you for being shy.
D．Shyness is difficult to overcome.