—Some Chinese students find it hard to get used to the life in London.

—Exactly, ______ they’ve learnt a lot about the city before.

A．if

B．now that

C．as though

D．even though

心脏正常搏动的条件是()

A．心的化赤作用

B．精志正常

C．心阳的温煦

D．心气的推动

E．心血、心阴的营养和滋润