Ⅱ级生物安全柜
参考答案：
是指用于保护操作人员、处理样品安全与环境安全的通风安全柜。Ⅱ级生物安全柜通常适用于生物危险度等级为1、2、3的媒质的操作。
单词拼写。
1. She went upstairs and f_______ her son playing computer games.
2. It's h_______ than yesterday. Would like to go swimming?
3. Now we have to get t_______ the exams.
4. Please don’t get the books together. These are mine and those are t_______.
5. Write down the new words on your paper, and be sure no to make m_______ in your spelling.
中 * * 党的成立，是中国历史上开天辟地的大事。下列图片，与这一事件相关的是[ ]
A．
B．
C．
D．
