我国科研人员以传统中药为原料先制得化合物I,再转化为具有抗癌抑菌活性的化合物Ⅱ,有关转化如图所示,下列有关说法不正确的是
My friend showed me round the town, ______ was very kind of him.
They use computers to keep the traffic _______ smoothly.
If you leave the club, you will not be_____back in .
What I need is_____ book that contains ______ABC of oil painting.
Jenny nearly missed the flight______ doing too much shopping.