根据课文“I Have Seen Amazing Things ”，从每题所给的四个选项中选出正确答案。
1．Why does the space station spin slowly in space?
A．To prevent itself falling onto the grou nd.
B．To look more beautiful.
C．To imitate t he pull of the earth's gravity.
D．To get away from the pull of the earth's gravity.
2．How do the space citizens send their messages?
A．By using typewriters.
B．By sending letters.
C．By sending emails.
D．By using a “thoughtpad”．
