如图为A、B、C三种物质的溶解度曲线，请根据曲线回答下列问题： （1）0℃时，A

航海家郑和是[ ]

A．维吾尔族人

B．女真族人

C．回族人

D．汉族人

Questions 9-13

·You will hear five people talking about what they teach.
·Questions 9 to 13, choose from the list A to F what each speaker teaches.
·Use the letters only once. There is one extra letter which you do not need to use.

• A. Basic Conversation—Greetings
• B. Oral English Level 1
• C. Practical Conversation—Talk about your hometown
• D. Daily Dialogue
• E. Business Travel English
• F. IELTS Skills
  Speaker 1 ( / 9 )
  Speaker2 ( / 10 )
  Speaker 3 ( / 11 )
  Speaker4 ( / 12 )
  Speaker 5 ( / 13 )

防冻液不仅有防冻功能，还有冷却及防垢功能。

依据《产品质量法》可以追溯生产者（）年前的质量违法行为。

A.一年

B.两年

C.三年

D.五年

游客用餐时，地陪应注意检查菜肴______和______，发现问题，及时补救。