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【单选题】
机翼对纵向静稳定性的贡献取决于重心位置，重心前移，纵向静稳定性将 。A.
降低
B.
提高
C.
不变
D.
N/A
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举一反三
【单选题】When can the passengers get their passports and luggage tags?
A.
On the first afternoon of the crusie
B.
On the last afternoon of the crusie
C.
At any time on board
D.
On the first evening of the crusie
【单选题】根据我国《环境保护法》的规定,关于排污标准制定权的表述正确的是( )。
A.
对国家污染物排放标准中己做规定的项目,也可以制定地方污染物排放标准
B.
对国家污染物排放标准中己做规定的项目,只能制定严于国家污染物排放标准的地方污染物排放标准
C.
环境质量标准只能由国务院环境保护行政主符部门制定
D.
地方污染物排放标准应当报国务院环境保护主管部门审批
【单选题】The second paragraph suggests that______.
A.
passengers can have control over intrusive adverts
B.
passengers can customize the TV
C.
passengers can watch what they want, when they want
D.
passengers cannot get rid of intrusive commercials
【单选题】The benefit of biological clocks for humans is ______.
A.
passengers can choose the flight time to adjust biological clocks
B.
people may sleep at daytime for better biological clocks condition
C.
shift workers can avoid their biological clock disorders
D.
patients can get the best result by taking medicines at different time
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