2. 外语
  3. Air transport will be safe because of

Air transport will be safe because of

admin2014-12-30  71
问题 Air transport will be safe because of
选项 A、new types of aircraft.
B、better training methods.
C、three-dimensional models.
D、improved technology.
答案D
解析 Paragraph 9: But before long our aircraft and cars will be piloted by computers which are never tired or stressed.
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