Do you know the year ______ the Chinese Communist Party was founded?
A：which
B：that
C：when
D：on which
There are many kinds of pollution on Earth, ____ ____, noise is a kind of pollution.
我国古代专制皇权不断加强，中枢权力体系也发生了相应的变化。下列表述符合史实的是（ ）
下列化学用语表示正确的是（ ）
