题目内容

[ A] Gentlemen
[B] Young people
[ C] Older people
[ D ] Doctor

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[A] and
[ B ] while
[C] however
[D] still

听第9段材料，回答第13 ~16题。
13. Why was Sally unhappy？
[ A] She could not sleep at night.
[B] She could not talk to the milkman.
[C] She had quarrelled with Mr. Smith.

[ A] guessed
[ B ] suspected
[ C ] questioned
[ D] figured

信号和象征符的区别有哪些？