Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.
A、emphaticallystatedA
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Some sea urchins海膽 have venomous (toxin) spines
In calculating the daily calorie requirements for an individual, variations in body size, physical activity, and age should be taken into account.
Blue－green algae grow abundantly in salt marshes.
Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
