将新鲜的鸡蛋轻轻敲碎，倒在培养皿内观察，对卵黄上的小白点解释错误的是： A．小白

They might just have a place ______on the writing course一why don't you give it a try?

A．leaves

B．left

C．leaving

D．to leave

用所给单词的适当形式填空。

1. Where can I do some_____ (shop)?

2. There are all _____ (kind) of bikes in the shop.

3. I'm going on for _____ (far) studies.

4. My English teacher is really _____ (friend) and kind.

5. Don't be _____ (worry). Our teacher is coming soon.

6. The girl finished her homework all by _____(her).

7. The old man has been _____ (die) for many years.

8. All of the girls sang and danced _____ (happy) at that party.

9. There is a _____(strange) over there.None of us knows him.

10. Three years_____ (late) the man became a doctor.

—Are you satisfied with the answer?

—Not at all. It couldn't have been ______.

A．worse

B．so bad

C．better

D．the worst

以下关于贷记卡紧急取现的表述，正确的是（）。

A.卡片可以没有任何锁定码。

B.可以凭支付密码办理。

C.受理紧急取现业务的网点必须具备传真机。

D.无交易手续费。

用金膜富集-冷原子吸收分光光度法测定环境空气颗粒物中汞含量时，捕集效率与采样流量有关，一般采样流量不宜过大，流量1L／min以下时捕集效率可以达到（）％，1.5L／min捕集效率为（）％，2L／min时捕集效率为（）％。