单项选择题

Explanatory research attempts to explore an area where little is known or to investigate the possibilities of undertaking a particular research study.
A、正确
B、错误

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单项选择题

Which of the following statements about elastic cartilage is TRUE?()

A．It provides flexible support.
B．It undergoes calcification during aging.
C．It has the ability to regenerate.
D．It resists deformation under stress.
E．It is very brittle and easily damaged.

单项选择题

下列关于早材与晚材的说法，表达正确的是
A、早材与晚材相比，细胞的孔径来的更致密
B、“树不怕空心”与早材和晚材有关
C、“树怕剥皮”与早材晚材有关
D、早材与晚材共同构成年轮