A
There are many beautiful cities in China. The weather in different cities is different. Now let's have a look at the weather in some cities in July.

()16. In Shanghai,it's in July.
A. warm B. hot C. sunny D. rainy
()17. What should you take when you visit Guilin in July?
A. A pair of sunglasses. B. A pair of shorts.
C. An umbrella. D. A T-shirt.
()18. Which city does the writer want us to visit in summer?
A. Harbin. B. Shanghai. C. Guilin. D. Beijing.
()19. We can enjoy in Harbin in winter.
A. flowers and trees B. flowers and hills C. water and hills D. ice and snow
()20. Which of the following is RIGHT?
A. Harbin has the highest temperature in July.
B. It's often rainy in Guilin in July.
C. We should wear warm clothes in Shanghai in July.
D. A lot of people visit Harbin in autumn.

16. B
17. C
18. A
19. D
20. B

16. 根据文中上海部分的描述“The weather is hot in Shanghai in July.”，可知上海七月天气炎热，对应选项B。
17. 根据文中桂林部分的“And it often rains in July, so remember to take an umbrella(雨伞) when you go out.”，可知七月去桂林要带雨伞，对应选项C。
18. 根据文中哈尔滨部分的“But it's also a good time to visit Harbin in summer.”，可知作者推荐夏天去哈尔滨游玩，对应选项A。
19. 根据文中哈尔滨部分的“Many people like visiting Harbin in winter. They can enjoy ice and snow there.”，可知冬天在哈尔滨可以欣赏冰雪，对应选项D。
20. 逐一分析选项：A项上海七月最高温32℃高于哈尔滨的28℃，该项错误；B项桂林七月经常下雨，符合原文描述，该项正确；C项上海七月建议穿T恤，不是保暖衣物，该项错误；D项人们喜欢冬季去哈尔滨，不是秋季，该项错误，故选B。