单项选择题

‌（）年前，从非洲南猿进化产生了人属。突出特点是脑容量增大，不仅能使用工具，还能制造工具。

A．240万
B．500万
C．700万
D．5500万

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单项选择题

随机变量的方差为则由切比雪夫不等式知（）

Here are ten topic-related sentences for workplace communication and try to remember them.
Script: 1. What can I do for you?
2. I’d like to buy a white shirt.
3. How much is it? / How much does it cost?
4. What size do you take?
5. We have your size, but not in the color you want.
6. Where are you going for your summer holiday?
7. How long will you stay there?
8. Do you have a one-day tour?
9. Is there anything special you want to see?
10. The trip is about five and a half hours long.
Listen again to the provided sentences rearranged in sequenceU6-S1-Listen and match

答案： Script:
Listen again to the above sentences rearranged...