单项选择题

A．The trip didn’t do any good to his health.
B．The trip helped him meet many interesting people.
C．The trip was enjoyable but not fruitful in terms of business.
D．The trip was a complete disappointment.
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问答题
“自然法则”这一术语之所以模糊不清，部分原因在于人们企图仅用这个术语指对这些法则中的某种法则的那些论断，如：有人认为科学仅研究因果关系，但实际上它三种都同样适用。
单项选择题
A．To limit discussion on heating bills.B．To determine temperature in homes.C．To prevent heat loss.D．To convert homes to electric heat.
A．To limit discussion on heating bills.
B．To determine temperature in homes.
C．To prevent heat loss.
D．To convert homes to electric heat.
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