题目

计算 （1） （2） （3） （4） 答案：解：原式 =−53+21+69−37=(−53−37)+(21+69)=−90+90=0 解：原式 =2×(−8)+4×5=−16+20=4 解：原式 =−1−17×(2−9)=−1−17×(−7)=−1+1=0 解：原式 =−5−8+9=−4阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。Cassandra De Pecol is the.【1】(young)and first woman to visit all 196 countries in the world.And she did it amazingly in 8 months and 26 days. Cassandra, also called Cassie, dreamed of.【2】(travel)around the world when she was young. She wanted to visit as many【3】(place)of interest as possible and learn about different cultures around the world.【4】she left college, she bought a huge map and started to plan her trip.Cassie finally started her journey at the Pacific island of Palau in July, 2015. When she arrived at one country, she.【5】(spend)two to five days in the country. The final country on her list was Yemen. When she finally got there, she was really【6】(excite). “It’s like a dream.” said Cassie, “I really enjoyed【7】(I) during my journey around the world.”The journey cost about 5200,000. in order to get support【8】her traveling dream. Cassie saved ＄10,000 by taking care of children and got【9】rest through sponsors(赞助者)。Cassie thinks herself “a world traveler, educator, and activist(活跃分子)”. During the trip, she planted trees in over 50 countries. She plans【10】 (write)a book on her trips and hopes to take a trip to the North Pole next year.