单项选择题

How often did the Head of Government of the Commonwealth usually meet for exchange of ideas

A．Every year.
B．Every four years.
C．Every two years.
D．Every three years.
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Which of the following statements about the US trade is TRUE
单项选择题
Which of the following statements is TRUE of Frisen
A．He was encouraged by his parents to do research on stem-cells.
B．He founded a company on drug research in Karolinska.
C．He was considered the best person on stem-cells research.
D．After graduation, he did what he had intended to do.
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