How many morphemes are tbere in the word "impassable" ?

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[单选题]How many morphemes are tbere in the word "impassable" ?

A. Two.
B. Three.
C. Four.
D. Five.

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学习资料：

[单选题]我国唐代中央官学设有“六学二馆”，其入学条件中明文规定不同级别官员的子孙进入不同的学校。这主要体现了我国封建社会教育制度的哪一特征?（ ）

A. 继承性
B. 等级性
C. 历史性
D. 民族性

[单选题]为了暂时记住朋友的电话号码以便拨号，最适宜的记忆策略是( )。

A. 组织策略
B. 精加工策略
C. 复述策略
D. 元认知策略

[单选题]下列不属于列夫·托尔斯泰创作的长篇小说是( )。

A. 《复活》
B. 《战争与和平》
C. 《巴黎圣母院》
D. 《安娜卡列尼娜》

[单选题]我国第一部记事详备的编年体史书( )。

A. 《国语》
B. 《左传》
C. 《离骚》
D. 《春秋》

[单选题]品德是道德品质的简称，它是一种( )。

A. 社会现象
B. 集体现象
C. 个体现象
D. 文化现象

[单选题] Looking for a new weight loss plan? Try living on top of a mountain. Mountain air contains less oxygen than air at lower altitudes, so breathing it causes the heart to beat faster and the body to bum more energy. A handful of studies have found that athletes training at high altitudes tend to lose weight. Doctor Florian Lippl of the University Hospital of Ludwig-Maximilians-University Munich wondered how the mountain air would affect overweight individuals if they weren't doing any more physical activity than usual. Lippl and his colleagues invited 200verweight men to an environmental research station about 300 meters below the summit of Zugspitze, a mountain around 2,970 meters near the Austrian border. They were allowed to eat as much as they liked. The men also gave blood so that researchers could test for hormones(荷尔蒙) linked to appetite and fatness. At the end of the week, the men, whose mean weight starting out was 105 kg, had lost on average about 1.5 kg. The men's blood pressure also dropped, which the researchers attributed to weight lost. Exactly what caused the weight loss is uncertain. Loss of appetite is common at higher altitudes, and indeed the men ate significantly less than usual-about 700 calories fewer per day. Lippl also notes that because their consumption was being recorded, they may have been more self-conscious about what they ate. Regardless, eating less accounts for just 1 kg of the 1.5 kg lost, says Lippl. He thinks the increased metabolic rate, which was measured, also contributed to weight loss but cannot separate the different effects with the given data. Appetite loss at high altitudes could certainly be key, notes Damian Bailey, a physiologist at the University of Glamorgan, UK, who recently lost 11 kg during a 3-month expedition to the Andes in Chile. Unfortunately, for the average person there's no treatment that can resemble living at high altitude, says Lippl. The only alternative is a hypobaric chamber, which exposes subjects to low oxygen and isn't practical as a therapy. He says, half-jokingly,"if fat people plan their holidays, they might not go to the sea, but maybe to the mountains."

What contributes the most to one's heart rates, according to the first paragraph?

A. Our bodyweight.
B. The consumption of energy.
C. The rates of our breathing.
D. The amount of oxygen provided.

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