Young people are under great pressure. Therefore, parents shouldn’t expect too much from them, for

it will only cause pressure to ________. [ ]

A. pick up

B. turn up

C. break up

D. build up

液氯气瓶上不能装设（）安全附件。

A、易熔合金塞

B、防震圈

C、瓶帽

D、护罩