单项选择题

What conclusion can we get from the passage

A．Engineering a perfect human is not feasible for the time being.
B．It's impossible for scientists to engineer a perfect tomato.
C．Many diseases will never be conquered by human beings.
D．Doctors will be able to cure all sorts of flaws in DNA in the long run.

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单项选择题

Which is TRUE in the following statements according to the passage

A．The Security Council convenes annually.
B．All UN members should abide by the decisions adopted by the Security Council.
C．Although one member seriously complains about another member's action, the Security Council will not convenes at its request.
D．The five permanent members of the Security Council hold less than one half armed forces in the world.

单项选择题

Why is the Security Council effective only when its permanent members can reach a consensus

A．Because every permanent member has the veto right of great powers.
B．Because all the permanent members won in the World War Ⅱ.
C．Because the other members of the Security Council are in the charge of the permanent members.
D．Because of some other reasons not mentioned in this passage.