问题
单项选择题
克隆化培养后的杂交瘤细胞应保存在
A.4℃冰箱
B.-20℃冰箱
C.-40℃冰箱
D.-70℃冰箱
E.-196℃液氮
答案
参考答案：E
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克隆化培养后的杂交瘤细胞应保存在
A.4℃冰箱
B.-20℃冰箱
C.-40℃冰箱
D.-70℃冰箱
E.-196℃液氮
参考答案：E
| 从方框中选择恰当的句子补全对话，使对话内容完整。 Sally: Hello ,Tommy! Tommy: Hi, Sally! Sally: Tommy, I lost (遗忘) something at home. I need them now. Tommy: __1__ Sally: I am at school. __2__. Tommy: Yes, I can. What do you need? Sally: I need my notebook, keys, pen and English-Chinese dictionary. Tommy: Your notebook? __3__ . Sally: It's in the drawer. Tomy: I know. __4__ Sally: Mmm..0h! They are on the dresser. Tommy: __5__ Sally: My pen is in the pellcil case and my dictionary is on the bookcase.
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