【单选题】DNA 一条链片段 5 ' ATCG3 '另一条链:
【判断题】Three kinds of verb tenses are frequently used in English news headlines: present tense, future tense and present perfect tense.
【单选题】According to the passage, the present tense in English is ______.
A.
not used to express one's readiness to do something in the immediate future
B.
used with some verbs but not with others to express future intention
C.
basically the same in English as it is in Spanish
D.
not the most difficult problem for foreign students
【判断题】吸光光度分析不仅适用于溶液,也适用于任何于气体和固体。( )
【判断题】当城市化发展到一定阶段以后,有可能出现过度城市化、城市收缩等现象。