欣赏王献忠的漫画《到“百度”里转了一圈》,根据要求答题。
The room was dark, so she asked me to _________ the lights.
已知a+1,2a﹣4是同一个数的平方根,求这个数.
How many boys and girls is there in your class?
A B C
____
大多数鸟类体内具有气囊,气囊在鸟飞行时所起的作用不包括( )