4. 已知且α为第二象限角,则m的允许值为
A. B. C. D.或
3.已知函数(、为常数,,)在处取得最小值,则函数是
A.偶函数且它的图象关于点对称 B.偶函数且它的图象关于点对称
C.奇函数且它的图象关于点对称 D.奇函数且它的图象关于点对称
2. 如果的三个内角的余弦值分别等于的三个内角的正弦值,则
A.和都是锐角三角形 B.和都是钝角三角形
C.是钝角三角形,是锐角三角形
D.是锐角三角形,是钝角三角形
1. 设,对于函数,下列结论正确的是
A.有最大值而无最小值 B.有最小值而无最大值
C.有最大值且有最小值 D.既无最大值又无最小值
20.What happened in Peter’s hometown?
A.A flood. B.An earthquake. C.A traffic accident.
19.What can we know about Peter’s hometown?
A.It is a flat city far from mountains.
B.It is a mountain village.
C.It is a mountain city.
18.How did Peter feel when he woke up?
A.Angry. B.Surprised. C.Afraid.
17.How long will the man’s friend stay with him?
A.One or two years. B.Several months. C.A few days.
请听第10段材料,回答第18至20题。
16.Where is the man’s friend from?
A.Germany. B.Australia. C.America.
15.How did the man feel when he received the letter?
A.A little disappointed. B.Very angry. C.A little surprised.
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