【答案】Both___ _ and ____ _ laughter do harm to your health.

Both___ _ and ____ _ laughter do harm to your health.

A.burst out crying;burst into

B.to burst out tears;to burst into

C.bursting into tears; bursting into

D.bursting into crying;bursting out
答案
A
解析
burst into laughter 突然大笑 这个是固定用法，前面是不加to的，所以排除下来只有选择A了!
例子：
1.When I told the joke everyone Burst into laughter .
当我说这笑话时每个人都忍不住笑出来.
2.Willie glared at her for a moment, then he burst into laughter .
威利先是对她怒目而视,随着也哈哈笑起来.
3.The teacher cracked a joke and all the kids burst into laughter .
老师讲了一个笑话,孩子们哄堂大笑.