某放射性元素的原子核发生两次a衰变和六次衰变，关于它的原子核的变化，下列说法中正确的是（ ）
﹣Pass the raincoat to me，please．It _______ hard now．
﹣Here you are．（ ）
is raining
rained
will rain
﹣ is it from your home to school？﹣It's about two kilometers．（ ）
How long
How far
How soon
How often
﹣I can't find my eraser．May I use _______？
﹣Of course．（ ）
you
your
yours
﹣What do you usually have for breakfast？
﹣Some bread，________ egg and a glass of milk．（ ）
a
an
the
﹣Can you tell me ？
﹣He lives in Shanghai．（ ）
where Mark lives
where does Mark live
where Mark lived
where did Mark live
衰变，关于它的原子核的变化，下列说法中正确的是（ ）衰变，关于它的原子核的变化，下列说法中正确的是（ ）
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