如图，一带正电的离子束沿图中箭头方向通过两磁极间时，它受的洛伦兹力方向
Who taught you to use Wechat（微信）？
Nobody． I learned it by ___________．（ ）
A．IB．meC．myself
I enjoy having____________ breakfast with my family at home． It makes me feel relaxed．（ ）
A．WhoB．theC．/
This year many doctors have become anti﹣epidemic（抗疫）heroes．We are proud of____________．（ ）
A．herB．himC．them
I like history， so I to Human Museum many times． （ ）
A．have beenB．have goneC．went
We are supposed to care about the workers keep our city clean．（ ）
A．whichB．whoC．whom
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