汤姆的领子，波莉姨妈是用（）色线缝的。 A.白色 B.黑色 C.蓝色 D.灰色

列宁曾经评论说：“华盛顿会议为太平洋两岸的两个大国的下一场战争，埋下了第一批火种。”这说明华盛顿会议没有处理好哪两个国家的矛盾

A．美国和日本

B．英国和德国

C．德国和法国

D．美国和德国

根据对话情景和内容，从对话后所给的选项中选出能填入空白处的最佳选项，并在答题卡上将该选项涂黑

Now Smith is at the booking office.

Clerk: Freedom Travel．Can I help you?

Smith:    小题1:   

Clerk: What is your destination?

Smith: Well，I’d like to fly to Helsinki, Finland. I’d like the cheapest flight available.

Clerk: Okay.    小题2:  There is one flight heading out then for $980. Will that be OK for you?

Smith: All right. I’ll take it.

Clerk: That’s Flight 1070 from Salt Lake City to New York, Kennedy Airport, transferring to Flight 90 from Kennedy to Helsinki.

Smith: _小题3:_

Clerk: It leaves Salt Lake City at 10:00 a.m. and arrives in New York at 4:35 p.m. You will then transfer to Flight 90 at 5:55 p.m., and arriving in Helsinki at 8:30 a.m. the next day.

Smith: All right.     小题4:  

Clerk: Sure , no problem. We will inform the airlines.    小题5:  

Smith: Will Smith.

A．Cheap flights might not be comfortable.

B．I’d like to make a reservation for 23rd.

C．Can I request a vegetarian meal?

D．When will the plane leave New York?E. Let me check what flights are available.

F. Could I have your name, please?

G. What are the departure and arrival times of those flights?

______是指调查人员在调查过程中，通过改变某些影响调查对象的因素，来观察调查对象消费行为的变化，从而获得消费行为和某些因素之间的内在因果关系的调查方法。

A．文案调查法

B．实地调查法

C．问卷调查法

D．实验调查法

某同学误将连接电路用的导线当作被测金属导线测出其直径,测量时仪器指示如图所示，则该导线的直径为:d= 　　 　    。

水污染物及其危害中，人体经常摄入遭受（）污染的水源，会产生慢性中毒，发生呕吐、腹泻、头痛头晕、精神不振等症状。

A.氰化物

B.硫

C.酚

D.放射性物质