问题
选择题
The Parkers bought a new house but________will need a lot of work before they can move in.[ ]
A．they
B．it
C．one
D．which
答案
| B |
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The Parkers bought a new house but________will need a lot of work before they can move in.[ ]
A．they
B．it
C．one
D．which
| B |
”和“
”分别代表两种不同的单质分子A2和B2，它们在一定条件下能发生化学反应，其反应的微观示意图如下，请回答下列问题：