搜题请搜索小程序“爱下问搜题”
问题 选择题

下列选项中，我国最早种植的农作物是[ ]

A．玉米  

B．棉花  

C．甘蔗  

D．茶叶

答案

答案：D

解答题
在△ABC中，已知sinB=cosAsinC．
（Ⅰ）判定△ABC的形状；
（Ⅱ）若
AB
•
AC
=9，△ABC的面积等于6，求△ABC中∠ACB的平分线长．
查看答案
补全对话，情景问答
口语运用，从所给句子中选出正确的选项填空，有两句是多余的。
A: 1.            I'm Sarah Smith. I'm from the USA
B: Nice to meet you
A: Nice to meet you, too. …
C: 2.            
B: Sarah Smith is an American girl. 3.             
C: She looks like my math teacher, Mrs. Smith. 4.            
B: Really? 5.             
C: Their names are both Smith.
B: Maybe you're right.
A. Whose girl is that?
B. She is my new classmate.
C. Let me introduce myself to you.
D. Whose student is that girl?
E. Mrs. Smith?
F. I think she might be her daughter.
G. Where does she come from?
查看答案