Unit 4 Astronomy- the science of the stars课时作业

language points

第一节　阅读理解(共15小题；每小题2分，满分30分)

　　阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

　　A

　　[2019·陕西省部分学校第一学期摸底检测]The following travel tips can help you get through an airport in the U．S. with minimal trouble.

　　Plan Ahead

　　Minimize your wait by scheduling your departure to avoid rush hours such as weekend mornings. Some airports have more than one access point for security; do a quick­Internet search or ask an airline official for the fastest line. If you often travel outside the country, the $ 50 fee for a five­year NEXUS card could save you as much as 90 minutes in a busy customs queue.

　　Pack Smartly

　　Avoid an unwanted search-or having to throw away your beloved face cream-by packing properly. Bottles or containers of liquids (100­millilitre format max) belong in a clear resealable bag (no more than one litre), and only one per person. The exceptions are baby food and milk.

　　Suffer the Search

　　Since 2010, Canadian airports have used full­body scanners that show what's under clothing. If you're selected for such a scan, you can choose a manual pat down instead. Someone of your gender (性别) will do the search, and you can request a private room with a witness.

　　Share Your Gadgets

If officials at the airport ask for your phone or computer password,