问题
选择题
---How was their last weekend?
---Great. They had a picnic in the park and enjoyed _______.
A．them
B．they
C．their
D．themselves
答案
答案：D
enjoy oneself的主语为they ，故后接themselves，故选D
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---How was their last weekend?
---Great. They had a picnic in the park and enjoyed _______.
A．them
B．they
C．their
D．themselves
答案：D
enjoy oneself的主语为they ，故后接themselves，故选D
2NH3，其反应速率分别为v(H2)、v(N2)、v(NH3)