简述长石砂岩的主要特征及其大地构造意义。

Why are the prices of mobile telephone services lower in China’s eastern coastal region a. The average disposable income is lower in the region. b. The GDP is higher in the region. c. The costs of operators are lower due to a greater number of users of mobile phone services in the region. d. The operators compete with each other in order to win over subscribers.

Students should by all means______ their studies though there are a lot of entertainments inviting them.

A．devote to

B．fix on

C．concentrate on

D．pay their attention

最宜制成胶囊剂的药物为()。

A．风化性的药物

B．具苦味及臭味药物

C．吸湿性药物

D．易溶性药物

E．药物的水溶液

我国区际法律冲突的特征包括（）

A.我国的区际法律冲突既包括不同社会制度之间的法律冲突，也包括相同社会制度之间的法律冲突

B.我国的区际法律冲突表现为三大法系之间的法律冲突

C.我国的区际法律冲突还表现为国际公约的效力范围问题

D.我国的区际法律冲突所体现的各法域的权利使单一制的中国带有某些复合国的特征