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问题 单项选择题

Compared to the normal distribution, the t-distribution most likely:（）

A. has fatter tails.

B. is more peaked.

C. has greater degrees of freedom.

答案

参考答案：A

解析：

如图2所示，与正态分布相比，t分布的图形较为平缓，从而在图形两端的概率分布值较大。

 [考点] t分布

完形填空

阅读下面短文，根据第58至第60小题的具体要求，尽可能简要回答问题，并将答案转写到答题卷上。

We leave London on 15 July, and we’ll be taking a flight to Morocco in northern Africa. We’re going to ride camels through the Sahara Desert. It’s the biggest desert in the world―about the size of the US! I expect it will be very hot, dry and dusty there. We’ll be travelling by camel with local guides, camping in tents and sleeping on the ground. I’ve heard that, in the Sahara, there is no shade during the day, and the stars seem especially brilliant on clear nights. I’ll bring a flashlight with me so that I’ll be able to see in the dark. Altogether, the trip will take six days. That means I’ll have to sit on a camel for almost a week―how uncomfortable! I hope my camel likes me!

小题1:Where will the writer take a trip to?(回答词数不超过5个词)

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小题2:What’s the weather like in the Sahara Desert?(回答词数不超过6个)

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小题3:How long will the writer stay there?(回答词数不超过3个)

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单项选择题

湿邪致病，缠绵难愈是因为

A．湿为阴邪，易阻遏气机
B．湿为阴邪，伤人阳气
C．湿性重浊，不易祛除
D．湿性黏滞，不易祛除
E．湿性趋下，为病缠绵
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