问题
单项选择题 A1型题
χ2值的取值范围是（）
A.-∞<χ2<+∞
B.-∞<χ2<0
C.0χ2<+∞
D.-1<χ2<1
E.χ2≤1
答案
参考答案：C
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χ2值的取值范围是（）
A.-∞<χ2<+∞
B.-∞<χ2<0
C.0χ2<+∞
D.-1<χ2<1
E.χ2≤1
参考答案：C
| 用下列框中词的适当形式填空。 | |
2. Zhai Zhigang is the _______ Chinese astronaut to walk in space. 3. There are some snakes, _______ and birds in this zoo. 4. In North America, many students walk or _______ the school bus to school. 5. Jim is really a _______ boy. |