问题
选择题
Look, in front of the house _____ with a history of over 100 years. [ ]
A. does a tall tree stand
B. a tall tree is standing
C. a tall tree stands
D. stands a tall tree
答案
答案：D
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Look, in front of the house _____ with a history of over 100 years. [ ]
A. does a tall tree stand
B. a tall tree is standing
C. a tall tree stands
D. stands a tall tree
答案：D
的衰变的方程式是：
的主要用途是作为示踪原子