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【单选题】
视觉信号分为昼间、夜间及昼夜通用信号，隧道内只采用（）信号。A.
夜间或昼夜通用
B.
昼间
C.
夜间
D.
昼间或昼夜通用
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反馈参考答案：
举一反三
【单选题】“As many languages as one speaks, so many lives...”means__________
A.
if one learns many foreign languages, one will have a better understanding of his own language
B.
life is richer and more interesting if one knows several languages
C.
no matter how many languages one knows, one can never know more than one's own culture
D.
if a person speaks only one language, he will live a very happy life
【单选题】实验过程中,如果切断家兔的双侧颈迷走神经,呼吸运动表现为( )
A.
幅度加大,频率减慢
B.
幅度加大,频率加快
C.
幅度减小,频率减慢
D.
幅度减小,频率加快
E.
幅度和频率均无明显变化
【单选题】在Windows XP桌面上，不能打开“资源管理器”的操作是( )。
A.
用鼠标右键单击“我的电脑”图标，然后从弹出的菜单中选取
B.
用鼠标右键单击“开始”按钮，然后从弹出菜单中选取
C.
用鼠标左键单击“开始”按钮，然后从系统菜单中选取
D.
用鼠标左键单击“任务栏”中该程序的图标
【单选题】\"As many languages as one speaks, so many lives...\" means__________A. if
A.
/"As many languages as one speaks, so many lives.../" means__________ A. if one learns many foreign languages, one will have a better understanding of his own language
B.
life is richer and more interesting if one knows several languages
C.
no matter how many languages one knows, one can never know more than one's own culture
D.
if a person speaks only one language, he will live a very happy life
【单选题】在Windows XP中，不能打开资源管理器窗口的操作是（）。
A.
用鼠标右键单击“开始”按钮
B.
用鼠标右键单击桌面上的“我的电脑”图标
C.
用鼠标左键单击“开始”按钮“程序”级联子菜单中的“Windows资源管理器”命令
D.
用鼠标左键单击“任务栏”的空白位置处
【单选题】How many ideas should a thesis statement toward one topic?
A.
one.
B.
two.
C.
three.
D.
as many as possible.
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