Where warm air replaces cold air it is called a .

Where cold air replaces warm air, it is called a .

During G protein signaling, the signaling cascade begins when _______. A: a phosphate is added to GTP B: GTP replaces GDP C: a phosphate is removed from GTP D: GDP replaces GTP

Will it be a(n) ______for human beings if one day AI replaces humans in many jobs?(observation/ tragedy)

It's a symbol of liberty. It____ liberty. A: replaces B: stands for C: is a representative of D: is an agent for

Local content laws are consistent with the principle of import substitution, in which domestic production replaces the importation of goods from abroad.

When one feature replaces an existing feature and the position remains as charted, ___command is used. A: MOVE B: DELETE C: AMEND D: SUBSTITUTE

While people may refer to microblogging for up-to-the-minute information, it is unlikely that microblogging ________ the newspaper completely. A: replace B: replaces C: replacing D: will replace

E-books are not going to ( )the printed books, because many people believe that paper books just feel good in their hands. A: replacing B: replaced C: replace D: replaces

中国大学MOOC: The human body is incredibly __________. When you donate a pint of blood, you lose about 3.5 trillion red blood cells, but your body quickly replaces them.