When a spacecraft travels, one of the major problems is the reentry into the Earth’s _______.
A. surface
B. atmosphere
C. altitude
D. band
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She is already 16 years old. But she _______as if she were still a little girl.
A. believes
B. absorbs
C. assesses
D. behaves
We are _______ at the rapid progress Mark has made in this semester.
A. distinguished
B. annoyed
C. shocked
D. scored
html5中使用css3样式有几种?
A. 1
B. 2
C. 3
D. 4
内嵌样式用什么声明?
A. head
B. style
C. body
D. html