In the following passages, some of the words have been left out. First read the passage over and try to understand what it is about. Then fill in the blanks with the help of the alternatives given.
It may be better to consider the effects of a large scale exchange of weapons which is (151) in the context of current nuclear (152). Within a millionth of a second after a nuclear weapon is (153), enough energy is released to heat the surrounding air to tons of millions of degrees Celsius, forming a hot (154) bubble of gases or a fireball. There is also a very intense (155) pulse which appears as a (156) flash of light lasting for a few seconds. As the fireball rises, it spreads out to form the (157) mushroom cloud and its (158) creates strong (159) at the ground level. This updraft containing dust, smoke and radioactivity created by the (160) forms the stem of the mushroom cloud.
ascent
increase
growth
growth
A.
ascent