When she first arrived in China, she wondered what the future might have_______ for her, but now all her worries are gone.

A．in need

B．in time

C．in preparation

D．in store

磁石主含的成分是（）

A.铁的氧化物

B.铁的硫化物

C.汞的硫化物

D.铜的硫酸化物

E.汞的氧化物