单项选择题

Why is a special substance painted on the tree

A．To make a wound smooth.
B．To prevent disease entering a wound.
C．To cover a rough surface.
D．To help a wound to dry.
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单项选择题
What does the agreement require Vietnam to do
A．To release war captures.
B．To cut down tariffs.
C．To export less.
D．To remove trade barriers.
单项选择题
When was sugar used widely
A．3,000 years ago.
B．In modem times.
C．Quite recently.
D．300 years ago.
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