西塞罗把下列哪一位的《经济论》译成拉丁文（）。
A.色诺芬
B.柏拉图
C.亚里斯多德
D.加图
参考答案：A
什么是电路交换方式？
—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.
A．hard
B．harder
C．hardest
D．hardly
