单项选择题

微分方程组

的平衡点为（）
A、(1,2)
B、(-1,2)
C、(-1,-2)
D、(1,-2)

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单项选择题

When mentioning 'the ongoing stock market on Wall Street', the writer ______.A.is calling attention to the privileges to which baby-boomers are entitledB.is calling for the government to take counter measures against labor shortageC.is refuting a notion about experienced workers' early retirementD.is justifying the ineffectiveness of federal tax and benefit policies

A.A.is
B.is
C.is
D.is

多项选择题

The two holiest cities of Islam in Saudi Arabia are（）.

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