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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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.
单项选择题
On which of the following aspects does Frisen disagree with some radicals
A．Whether research should be done on embryonic stem cells.
B．Whether research should be done on adult stem cells.
C．When should people expect a drug for Parkinson’s.
D．When should clinical trials of stem-cells research begin.
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