When plutonium undergoes fission, its atoms break apart, giving off a great deal of energy

Some American women are too afraid of finding cancer to undergo screening.A．RightB．WrongC．

A．experienceB．witnessC．watchD．undergo

Many American women are too afraid of finding cancer to undergo screening.

Children all undergo babbling, holophrastic, two－word, and the telegraphic speech sta

_____, water turns into ice.A、When freezingB、When frozenC、When it has been frozenD、When

When people opening up？A.When they feel powerfulB.When they are sickC.When they are unc