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【单选题】
在已知某小片段基因碱基序列的情况下，获得该基因的最佳方法是 [ ]A.
用mRNA为模板反转录合成DNA
B.
用4种脱氧核苷酸为原料人工合成
C.
用PCR技术制备
D.
有蛋白质的氨基酸序列推测mRNA
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举一反三
【单选题】Which of the following cities has the oldest Chinatown in North America?
A.
New York.
B.
San Francisco.
C.
Boston.
D.
San Diego.
【单选题】In______, Chinatown has been the center of its Chinese community since the 1850s, which is a crowded and authentic ethnic neighborhood where Cantonese remains the first language for many.
A.
Boston
B.
New York
C.
Washington D.C.
D.
San Francisco
【单选题】The Indian old lady ________ live there ________. [ ]
A.
no; any more
B.
does not; any more
C.
no, any longer
D.
do not; any more
【简答题】London’s Chinatown has become a growing _______________.
【简答题】does not offer any scholarships?__________
【简答题】San Francisco has a very large “Chinatown". Thousands of Chinese live in Chinatown.
【单选题】The board of directors_______has had different views on the current economy.
A.
strong
B.
stronger
C.
strongest
D.
strongly
【简答题】RAM一般又可分为两大类型()
【单选题】Chinatown has been the center of San Francisco's Chinese community since the 1850s. Its boundaries have expanded significantly since the 1960s, and the neighborhoods built there are generally wealthy.
A.
plentiful
B.
attractive
C.
friendly
D.
rich
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