DNA 一条链的部分碱基顺序为 5'-ATCT-3',与其互补的链(__)。
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Labor Day in the US falls on the _________ Monday in September.
The speaker seemed a little nervous ___________, but after a short while became relaxed.
You want to learn making Chinese dumplings? ________of all, let me show you how to make dough.
It was sunny but cool when we started. So the journey was quite pleasant______________. Then all of a sudden there came a thunderstorm.