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【单选题】
大气是生物的气体环境，含有生物生存必需的氧以及其它微量气体，__________对昆虫的活动、迁移和分布有着重要影响。A.
大气运动
B.
气体成分
C.
大气性质
D.
大气组分
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举一反三
【单选题】Section B Long Conversations Conversation 1— A Discussion about Picasso Questions 8 to 11 are based on the conversation you have just heard. 8.
A.
The 20th century.
B.
The 19th century.
C.
The 21st century.
D.
The 18th century.
【简答题】Questions 1-8 are based on the eight short conversations you have just heard.
【单选题】Section B Long Conversations Conversation 1——The Purpose of Nanobots Questions 8 to 11 are based on conversation you have just heard. Question 8
A.
They are large in size.
B.
They are small in size.
C.
They are extremely small in size.
D.
They are very large in size.
【简答题】工业机器人的基本组成部分包括 、 、 。
【简答题】在下列式子中变形正确的是（ ） A．如果a=b，那么a+c=b-c B．如果a=b，那么 a 3 = b 3 C．如果 a 2 =4 ，那么a=2 D．如果a-b+c=0，那么a=b+c
【简答题】Questions 1-8 are based on the 8 short conversations.
【单选题】listen to the following two conversations and complete the following exercises. conversation 1-8
A.
To confirm an urgent appointment.
B.
To collect a package from the woman.
C.
To ask the woman to sign a document.
D.
To arrange the delivery of a package.
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