多音字。
乐( )( )空( )( )长( )( )着( )( )
lè yuè kòng kōng cháng zhǎng zhē zháo
下列说法正确的是( )
A.在化学反应中,元素的种类不会改变
B.人体胃液的pH>7
C.饱和溶液一定是浓溶液
D.核外电子数相同的Na+和Mg2+,它们的质子数也相同
Compared with his sister, Jerry is even more ______ to, and more easily troubled by, emotional and relationship problems.
A.skeptical
B.addicted
C.available
D.sensitive