单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．He is always punctual for his class.
B．He rarely notices which students are late.
C．He wants his students to be on time for class.
D．He doesn’t allow his students to tell jokes in class.
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单项选择题
The attitude of the Federal Bureau of Investigation shows that ______.
A．enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members
B．enough data of DNA samples should be collected to confirm that only DNA samples from the same person can match
C．enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same person
D．additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person 61. The National Academy of Sciences holds the stance that ______ .
单项选择题
When did hydroelectric power was universally considered as an environmentally safe and clean means of electricity generator
A．Around 250 BC.
B．In 1982.
C．In the middle .years of 20th century.
D．Until only recently.
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