He doesn't like birthday cakes __________ birthday cards, but he likes parties.

欧洲第一长河是：

阅读短文，根据短文内容，选择正确答案。

Bob: Hello, Candy! What are you going to do on Sunday?

Candy: Oh, I'm going to the park to have a picnic.        

Bob: Do you like having a picnic?

Candy: Yes, I do. What about you?

Bob: Me, too. But my favourite hobby is playing computer games.

I think it's very fun.

Candy: D o you want to go with us?

Bob: Sure. What time?

Candy: At 8:00 o'clock tomorrow.

Bob: OK. See you later.

Candy: See you.

标况下将448L氯化氢溶于1L水（纯水的密度为1.0g/cm³），所得溶液密度1.1g/cm³，溶液中氯化氢的浓度为（　　）