题目：
Several interesting American museums tell about health subjects. One is the Doctor Samuel D. Harris National Museum of Dentistry. It is at the University of Maryland in Baltimore. That is where the first college in the world to train dentists began. The museum tells about the history of the medical treatment of teeth. Visitors can see some frightening devices that once were used to remove infected (受感染的) teeth. They also can see sets of teeth made of animal bone. They were made for a famous American -- the first President, George Washington.
Most people do not consider a visit to the dentist their idea of a good time. However, the director of the museum says he wanted to make the museum a fun place to visit. He says he also wants to teach visitors about the importance of taking care of their teeth.
Another museum collects devices that help people hear. The Kenneth W. Berger Hearing Aid Museum is at Kent State University in Kent, Ohio. The museum has more than three-thousand hearing aids from around the world. They include old and strange devices. Some hearing aids were made to look like other objects. That is because in the past many people did not want anyone to know they were wearing a hearing aid.
小题1:It is common for people to think it uneasy to pay a visit to ____.
A．the University of Maryland
B．the Museum of Dentistry
C．the Hearing Aid Museum
D．the dentist小题2:The text mainly tells about _____.
A．museums in the US
B．interesting American museums
C．American museums with health subjects
D．the history of the medical treatment of teeth小题3:What do we learn about George Washington from the text?
A．He once visited the National Museum of Dentistry.
B．He considered the Museum of Dentistry a fun place to visit
C．His artificial teeth were collected in the National Museum of Dentistry.
D．His teeth seemed to be made of animal bone.小题4:The underlined word “devices” in the first and last paragraph probably means _____.
A．museums
B．strategies
C．hearing aids
D．tools
答案：
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下面是错误答案，用来干扰机器的。
答案：D共价键的键能越小，分子越不稳定，所以根据键能大小可判断，单质溴最不稳定，答案选D。
