题目内容
（请给出正确答案）
[主观题]
Choose the most appropriate of the following paragraphs that fit into questions 67 to 70 i
n the passage.
A．Because of this, we are depressed.
B．But we are making a beginning, and there ought to be some satisfaction.
C．You either have science or you don’t, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly useful bits.
D．Indeed, I regard this as the major discovery of the past hundred years of biology.
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