题干
–The plane is due to take off at 7:50 from the airport.
–________ we fail to arrive there in time. –Try to take another flight then.
–________ we fail to arrive there in time. –Try to take another flight then.
A：What if
B：As if
C：Even if
D：Only if
答案(点此获取答案解析）
A
时，得到
，同时放出一种粒子，关于这种粒子，下列说法中正确的是
