No one could explain how it had （) that he survived the air crash.A、becomeB、arrivedC、re

Explain why addition of HNO₃to concentrated H₂SO₄results in the formation ofandions. How could one test experimentally to confirm that such ions exist in H2SO4 solution？

One reason that might explain Page's sleeplessness was _________.

A．his mother's injury before he was born

B．that he had gradually got rid of the sleeping habit

C．his magnificent physical condition

D．that he hadn't got a bed

One reason that might explain Page's sleeplessness was______.

A．his mother's injury before he was born

B．that he had gradually got rid of the sleeping habit

C．his magnificent physical condition

D．that he hadn't got a bed

A、altogether

B、get-together

C、all together

D、all-together

A、closely

B、tightly

C、loosely

D、strictly