That the letter is found and answered so many years later is a（n)______to all the people.

Which of the listed design features is found in an exhaust valve and NOT in an intake valv

The relationship between music and silence is just like that between______.A．experience an

Which of the following is NOT an imperative sentence？A．You take that seat, and I"ll take t

What is the duality of the language？A．Letters and sounds.B．Sounds and symbols.C．Symbols an

A combination combustible gas and oxygen indicator is an instrument that measures the_____

Cancer is among the top killer diseases in our society today and scientists have found out that stre