调制解调器（Modem）的功能是实现（）。A、模拟信号与数字信号的转换 B、数字信号的

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

Taking a math test can be pretty stressful. Even if you know the material, you can still get the problem wrong. Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided.   小题1: 

Write it out

You can also check a math problem by writing everything out on paper.   小题2:  Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers.

 小题3: 

Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around. In other words, you would use the opposite of this addition problem—subtraction (减法)—to determine whether or not your answer is the correct one.

Plugging in

You may find that a variable(变量) isn’t good enough or have a problem where you have to solve for a variable.   小题4:  This is the only real way to assure yourself that the answer you’ve found is correct.

Check for a reasonable answer

  小题5:  For example, if you get an answer in the millions and you know it should be in the thousands, you’ve likely misplaced a point. Go back through the work on your paper to make sure all of your formulas and calculations are correct. If everything looks okay, do the problem again and compare the result of the second try to what you’ve got on the first try.

A．Do the opposite

B．Correct the answers

C．Plug the variable in the equation (方程) to check it out.

D．Therefore you’ll improve your grades, as well as your math skills.E. It also helps you to figure out everything after you have already finished the test.

F. If the result of a problem seems to make no sense, it indicates that the answer is incorrect.

G. This helps you to know what information you have and what information you need to solve.

My uncle’s plane ____. Let’s wait for him here.

A．hasn’t arrived

B．didn’t arrive

C．doesn’t arrive

D．couldn’t arrive

第三方损伤破坏情况报告应包括时间、地点（）、破坏原因、破坏面积大小以及相关图片等。

A.护坡类型

B.水工设施类型

C.破坏类型

D.破坏人员

患者为2岁，无牙颌，全口义齿修复10年，上颌义齿尚可，下颌义齿稳定性差，本次就诊要求“能戴稳假牙，能吃东西”。临床检查发现下牙槽嵴低平，旧义齿固位不良，人工牙面不均匀磨耗，面下1／3低。

对该患者哪种修复方法最为理想（）

A.上、下颌各6个种植体固位的全口固定义齿

B.上、下颌各2个种植体固位的可摘全口义齿

C.上颌全口义齿，下颌2个种植体固位的可摘全口义齿

D.重做一副全口义齿

E.旧义齿重衬

所谓“供养”，通常是指亲属之间有经济能力、生活能够自立的人，对那些无经济能力、生活不能自立的人，予以经济上的供给和生活上的照料。供养关系把那些由婚姻纽带联系起来的人们，又用经济纽带联结在一起，使家庭成为一个社会实体。
这段话支持了这样一种观点( )。

A．“供养”是指对丧失经济能力、生活自立能力的亲属给予经济上的供给和生活上的照料
B．“供养”就是指家庭中幼辈对长辈的赡养
C．是供养关系把亲属用经济纽带联系起来
D．“供养”就是指家庭中年长者为年幼者提供经济供给和生活照料的义务