在氧气（O₂）、二氧化碳（CO₂）、二氧化锰（MnO₂）、过氧化氢（H₂O₂）四种物质中，下列叙述正确的是（　　）

A．都是氧化物

B．都是化合物

C．都含有一个氧分子

D．都含有氧元素

The tendency today is for teachers and parents to emphasize individual responsibility and to stress that educational goals for students should be () to their chosen vocations rather than provide a generalized higher education.

A. subjected

B. stimulated

C. developed

D. geared