若2x+1=3，则6x+3的值为____
血液从心脏流出，流经肾脏后血浆成分发生的主要变化是（ ）
- Have you decided what to do next?- No. We'll wait to see what_______ we'll draw from the experiment.
青蛙的幼体和成体的呼吸器官分别是（ ）
a taxi for me even though I told him I lived nearby.
则“
且
”是“
”的