I ask you to sit down ___________ table, not to sit down ___________ the table.
A:at; in
B:at; at
C:on; to
D:in; in
只要反射弧完整就可以有反射活动.(判断对错)
将要上钩的鱼,会被岸上的脚步声吓跑,表明 ____和 ____能够传声.