丝绸之路是一条横贯亚洲、连接欧亚大陆的著名古代陆上商贸通道。丝绸之路已有2000余年的历史了，她的魅力是永恒的。今天，古老的丝绸之路沿线众多的历史名胜、文化古迹、壮丽的自然风光和多姿多彩的风土人情仍然吸引着成千上万来自世界各地的旅游者。历史上，骆驼曾经是丝绸之路上的主要交通工具；今天，游客可乘飞机、火车、汽车沿丝绸之路旅行，既快捷便利，又舒适安全。

单项选择题Which of the following statements best describes the birling match（）

A. Players should use the peaveys to push a heavy log into the water.< br>B. Players were expected to walk fast in the center of the log and spin it as fast as they could.< br>C. Players should force the opponent off the log into the water.< br>D. Players should not lose their balance and fall off into the water.

单项选择题Which of the following statements conveys the author’s message in the sentence How synaesthesia starts is also unclear （）

A. It is unclear what happens when synaesthesia starts.< br>B. It is still not known how the connections become so strong.< br>C. It is unclear as to whether synaesthesia can affect people’s sensation or not.< br>D. It is still not known why one stimulation evokes the sensation of another.

单项选择题We can infer from the passage that（）

A. probiotic products can prevent cancer< br>B. probiotic products can regain the health of intestinal microbes’ population< br>C. probiotic products were discovered in the 1950s< br>D. people need live bacteria to restore or improve health

单项选择题Which of the following experiments has NOT been done by researchers（）

A. They placed a sparrowhawk, cuckoo, dove, or duck around the tits and observed the tits’ reaction.< br>B. They set up feeding stations and observed why tits are not parasitized by cuckoos.< br>C. They covered the hawk-like markings on the cuckoo and observed the tits’ reaction.< br>D. They added the hawk-like markings on the dove and observed the tits’ reaction.

单项选择题（） were originally called Yankees, which came to stand for all Americans.

A. People living in New England
B. People living in New York City
C. People living in Florida
D. People living by the Mississippi River