____ the blackboard! What can you ____ on it

How did your uncle learn to play the guitar—By ________.

ing to scientists, our mental abilities beginto____ from the age of 27 after reaching the highest level at 22.

Did Tom win the long jump— Of course he did. He jumped ________ than any other jumper.

班里四位同学在以下加点字词的读音上出现了分歧，请判断下列哪位同学的读音是全部正确的。挑剔 氛围 欺侮 剽窃 求本溯源 数见不鲜 安步当车