单项选择题

Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.

A. determined
B. argued
C. hypothesized
D. griped

<上一题目录下一题>

热门试题

单项选择题

In Hawaii, endemic birds, such as the omao and the apapane, dwell in the volcanic highlands and tropical rain forests.

A. alluring
B. dense
C. graceful
D. native

单项选择题

Galena, the chief ore of lead, is a brittle mineral with a metallic luster.

A. hazel
B. dense
C. breakable
D. sparking

相关试题