由城市的某—地区输送大量燃气到另一地区,则采用()的输气压力比较经济合理.
A、较低
B、低
C、较高
D、常压
参考答案:C
下列不属于器官的是
A.胃腺
B.心脏
C.血液
D.皮肤
Nothing is so easy as ________ parents to raise their expectations of their children too high. (2012·福建,33)
A.of
B.to
C.by
D.for