——Some students often drop litter carelessly in our school. What can we do?——We can _______ some signs to remind them not to do that again.
A：put up
B：put off
C：put away
D：put on
镍氢电池是近年开发出来的可充电电池，它可以取代会产生镉污染的镉镍电池．氢镍电池的总反应式是：12 H2+NiO（OH）=Ni（OH）2据此反应式判断，下列叙述中正确的是（ ）
肥肉中含有大量脂肪，这些脂肪在消化道内完全消化后的产物是（ ）
