题干
一 My cousin is a clever boy and he is good at math.
一 So he is.
A：is worried about
B：does well in
C：is interested in
答案(点此获取答案解析）
B
一 My cousin is a clever boy and he is good at math.
一 So he is.
A：is worried about
B：does well in
C：is interested in
分别表示不同元素的原子），下列对图示反应的理解中，正确的是 （ ） 