问题 单项选择题

如经纬仪横轴与竖轴不垂直,则会造成下述中的哪项后果?()

A.观测目标越高,对竖直角影响越大

B.观测目标越高,对水平角影响越大

C.水平角变大,竖直角变小

D.竖直角变大,水平角变小

答案

参考答案:B

判断题
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Dear Betty,

     My roommate's family wants me to celebrate Thanksgiving Day with them in their home. I accepted

the invitation, and I'm excited about going, but I'm a little nervous about it, too. The social customs in my

country are different from those here, so I'm a little worried about making mistakes.

Should I bring a gift, such as candy or flowers? Should I arrive on time or a little late?  At the dinner

table, how can I know which fork or knife to use? How can I let the family know that I'm thankful for

their kindness?

                                                                                                                                       Yours,

                                                                                                                               Knowing Nothing

Dear Knowing Nothing,

     It's a good idea to bring a gift when you go to a dinner party. Flowers are always welcome, or you

can bring a bottle of wine if you know the family drink it.

     You should arrive on time or five to ten minutes late. Don't get there early. If you are going to be more

than fifteen minutes late, you should call and tell them.

     Try to relax at the dinner table. If you don't know how to use the right fork, knife or spoon, just watch

the other guests, and follow them. If you still have no idea of what to do, don't be shy about asking the

person next to you; it's better to ask them than to be silently uncomfortable and nervous.

     If you like the food, say so. Of course, you'll thank the host and hostess for the meal and for their

kindness. It's also a good idea to send a card to thank them the day after.

                                                                                                                                    Yours, 

                                                                                                                                     Betty

1. Knowing Nothing wrote a letter to Betty to _____.

A. tell Betty some good news          

B. ask for some advice

C. answer some questions        

D. invite her to dinner

2. According to Betty, Knowing Nothing ______ when going to a dinner party.

A. can only bring some flowers

B. can't bring wine

C. should arrive on time or five to ten minutes late

D. should arrive twenty minutes late

3. Betty does NOT advise Knowing Nothing to _____.

A. relax at the dinner table          

B. watch the other guests

C. ask the person beside him          

D. keep silent at table