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【判断题】
当AT89S51单片机的晶振频率为12MHz时 ,机器周期是2uSA.
正确
B.
错误
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举一反三
【单选题】The little girl sat at the door with her legs ___ and kept her eyes ___at the planes flying in the sky.
A.
crossed; looking
B.
crossing; looking
C.
crossed; looked
D.
crossing; looked
【单选题】The little girl’s eyes were red. She ______.
A.
may cry
B.
must cry
C.
must be cried
D.
must have been crying
【单选题】--Who is the girl ______ long hair and big eyes? -- Oh, it’s our new classmate, Betty.
A.
at
B.
with
C.
have
D.
by
【单选题】The girl has big eyes. But father’s eyes are bigger than .
A.
she; her
B.
her; hers
C.
she; hers
D.
hers; her
【单选题】婴儿两个月会抬头,四个月会翻身,六个月会坐,七个月会滚,八个月会爬,一周岁会走。这说明儿童发展具有( )。
A.
个别差异性
B.
不平衡性
C.
定向性与顺序性
D.
连续性与阶段性
【单选题】The girl who _______ beautiful eyes _______a prize in yesterday’s singing contest.
A.
has; wins
B.
had; won
C.
having; won
D.
has; won
【单选题】What’s wrong with the girl’s eyes?
A.
She can't see clearly.
B.
She has a sore eye.
C.
Her eyes are red.
D.
She is blind.
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