单项选择题

We can conclude from the first two paragraphs that whether a male practices monogamy of polygamy depends on ______.

A．the amount of nurturing the young
B．the sex of offspring
C．the attractiveness of his female partner
D．the time of conception
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单项选择题
According to the passage, which of the following is TRUE of male dik-dik
A．He can in principle defend more than one female.
B．He practices monogamy.
C．He invests heavily in his offspring.
D．He is partly monogamous and partly polygamous.
单项选择题
Why do people still argue about who deserves the credit for the concept of the laser
A．The researchers' notebooks were lost.
B．Several people were developing the idea at the same time.
C．No one claimed credit for the development until recently.
D．The research work is still incomplete.
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