9+6=____
9+7=____
9+8=____
9+9=____
—Tommy looks so tall.
—That's right.Tommy is known as the tallest boy in our school.
给下列句中加线的“食”字注音并释义。
①一食或尽粟一石____
②食马者不知其能千里而食也)____
③食不饱,力不足。____
④食之不能尽其材。 ____
下列与声现象有关的说法中正确的是( )