单项选择题

The panda is an endangered species, which means that it is very likely to become （） without adequate protection.

A．intact
B．insane
C．extinct
D．exempt

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单项选择题
Researchers have discovered that （） with animals in an active way may lower a person’s blood pressure.

A．interacting
B．integrating
C．migrating
D．merging
单项选择题
America has now adopted more （） European-style inspection systems, and the incidence of food poisoning is falling.

A．discrete
B．solemn
C．rigorous
D．autonomous
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