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
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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.
单项选择题
It can be inferred that even though the mailsters were small, uncomfortable, and dangerous, they could______.
A．eliminate the need for relays
B．carry handcarts and pouches as well
C．be more protection than an umbrella
D．reduce wear on shoes
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