It remains unknown whether the rate of cell turnover in diseased hearts____________.

The passage suggests that oxygen remained in the atmosphere because ______.A．it was caused

The clause in the sentence "It is still unknown whether she will come or not" isA．the obje

In the sentence "This beautiful village remains unknown to the rest of the world", the ita

The ______ of the word is unknown, but it is certainly not from Greek.[2001]A．originB．gene

The mothers role has remained_____ and constant throughout the ages.A．proximateB．staticC．r

It isnt so much whether he works hard; the question is whether he works______.A．at allB．ab