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【简答题】
给出下列命题： ①存在x∈ ，使sinx+cosx= ； ②存在区间（a，b），使y=cosx为减函数而sinx＜0； ③y=tanx在其定义域内为增函数； ④ 既有最大值和最小值，又是偶函数； ⑤ 的最周期为π； 其中错误的命题为（ ）。（把所有符合要求的命题序号都填上）
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举一反三
【单选题】____ woke me up at five.
A.
The bird singing
B.
The bird is singing
C.
The bird to sing
D.
The bird's singing
【单选题】I _____ while watching the movie 2012 last night. Unluckily, my roommate woke me up.
A.
had fallen asleep
B.
have fallen asleep
C.
fell asleep
D.
fall asleep
【单选题】I ______ while reading the English textbook. Luckily, my roommate woke me up in time !
A.
had fallen asleep
B.
have fallen asleep
C.
fell asleep
D.
fall asleep
【单选题】I_______ while reading the English textbook. Luckily , my roommate woke me up in time!
A.
fell asleep
B.
had fallen asleep
C.
have fallen asleep
D.
fall asleep
【简答题】阅读理解。 Mr father woke me up early one summer morning when I was four and announced (宣布):'Get up, you're going with me to cut the grass in the garden.' The idea that my father thought I was old enou...
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