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【单选题】
大多数常用的酵母载体,经常使用一个普通酵母基因作为选择标记,比如一个与氨基酸的生物合成有关的酶的基因,宿主细胞必须是一个_______。A.
营养缺陷型
B.
B琥珀突变型
C.
C乳白突变型
D.
D赭石突变型
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举一反三
【简答题】口算． 7×30= 63÷3= 56-39= 14×4= 560÷8= 500×9= 400÷8= 13+37=
【单选题】The navigation systems in cars like Lexus, BMW and Audi are mentioned to show ______.
A.
the immaturity of the new technology
B.
the superiority of the global positioning system
C.
the cause of price fluctuations in car equipment
D.
the different ways of providing guidance to the driver
【简答题】什么是雪崩倍增效应？
【单选题】Cars are mentioned in Paragraph 2 to show ________.
A.
the Internet can provide maps to guide drivers in traffic jams
B.
people can solve air pollution and traffic jams by using the Internet
C.
the Internet, like cars, brings convenience and causes problems at the same time
D.
the negative effects they cause
【简答题】直接写出得数 3.05×1000= 125×8= 84+0÷16= 156-28-72= 9.1÷10= 56+= 900÷25÷4= 37+63×0=
【单选题】What are the negative effects of ordinary cars mentioned in the lecture?
A.
Cars cost too much
B.
Cars are hard to repair
C.
Cars often cause traffic jam
D.
Cars killed people in accidents
【简答题】把80,36,63,56,37这五个数按从小到大的顺序填在方格里。
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