问题
选择题
You are a student. I am a student, __________.[ ]
A. either
B. neither
C. to
D. too
答案
答案：D
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You are a student. I am a student, __________.[ ]
A. either
B. neither
C. to
D. too
答案：D
)，产生磷核(
)和x粒子，磷核(
)和y粒子，则x粒子和y粒子分别是