Unit 4 Astronomy：the science of the stars
Ⅰ.情景默写
1.The Transition is now going through crash(碰撞)tests to make sure it meets federal safety standards.(2017·全国卷Ⅱ)
2.These include custom－made navigation(导航)tools，night vision systems(系统)and intelligent speed adaptations.(2017·全国卷Ⅲ)
3.Worse still，being addicted to cell phones might also lead to teenagers’ poor performance at school，thus(因此)adding to the elders’ worries.
4.His gentle(温和的)smiles and ready hands have always been our best prides.
