--- Would you like to go swimming with me?

---            , but I must finish my homework first.

A．I’d like to

B．Yes, let’s go

C．No, I won’t

D．It doesn’t matter

贸易具有创造效应，在关税同盟内成员国可以购买其他成员国低成本、低价格的产品，从而使消费者节省开支，提高生产效率，降低生产成本。