观察血液的时候，老师把抗凝剂加进装有鸡血的试管，静置一段时间后，发现血液出现了分层现象，其中白色的、很薄的一层是

在玻璃管一端扎上橡皮膜，然后将玻璃管开口向上，橡皮膜向下竖直插入水中，在逐渐向下插的过程中，橡皮膜将（　　）

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

W: What ____ wonderful place!

M: I wanted the best restaurant ____ your birthday. And I know you like French food. Let's begin with a cocktail(鸡尾酒) and then look at the menu.

W: I don't want to look at it because ____ always takes me a year to make up my mind. Any suggestions?

M: I've never been here before, but everything ____ (suppose) to be excellent.

W: They have snails(蜗牛)! But I wouldn't dare eat them. They might make me sick.

M: I feel the same way about snails. I think I'll have roast duck(烤鸭). It comes with vegetables and potatoes.

W: ____ (sound) good. But ____ I like seafood, I'd like ____ (begin) with some seafood. And let's have the salad after the main course.

M: Fine. We should have white wine with dinner and champagne(香槟)with dessert since this is ____celebration.

W: Oh, don't forget the cheese. There's nothing like real French cheese.

M: I can see already this ____ going to be an ____ (enjoy) and delicious dinner.