单项选择题

What does the passage mainly discuss

A．Nuclear fusion in supernovae.
B．Defining a supernova.
C．The process of the death of stars.
D．Gravitational force and its effects on supernova
<上一题 目录 下一题>
热门 试题

单项选择题
The author mentions that tile nuclear fusion is a result of______.
A．hydrogen fusing into helium
B．hydrogen and helium becoming hot
C．helium changing to carbon and oxygen
D．an increase of helium at the center
单项选择题
What is the title of this passage
A．From Satchels to Mailsters.
B．Too Much Mail.
C．Mailster Mishaps.
D．Motorizing the Mail.
相关试题