【单选题】Many children have formed the habit of reading but _____ notes meanwhile. [ ]
【单选题】位于生产可能性曲线以内的任何一点表示( )
【单选题】位于生产可能性曲线以内的任何一点表示( )
【单选题】保藏温度的选择上,菌种保藏时通常选择( )进行。
【简答题】酶活性指在规定条件下单位时间 内( )或( ) 。酶活性单位是指一定条件下使酶促反应达到某一速度时所需要 的( ) 。
【单选题】In many places in China, the old over 90 not only by their family but also by the government.
B.
are taken good care of
C.
is taking good care of