单项选择题

According to the passage, male marmoset and tamarin monkeys ______

A．can't defend more than one female
B．practice monogamy
C．get more offspring
D．invest heavily in their partners and the young
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单项选择题
In this research at Columbia University, Charles Townes worked with ______.
A．stimulated emission
B．microwaves
C．maser
D．stimulated emission and microwaves
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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