关于正畸治疗中的牙根吸收的原因与影响因素，下列正确的是（）

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问题单项选择题

A.男性患者牙根吸收的发生率和严重程度比女性高

B.儿童患者易发生根吸收

C.成人患者很少发生根吸收

D.下颌牙齿比上颌牙齿容易发生根吸收

E.前牙比后牙更易发生根吸收

答案

参考答案：E

多项选择题

设备压力试验有( )。

A．水压试验

B．超声试验

C．气压试验

D．气密性试验

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单项选择题

If we take a close look at successful language learners, we may discover a few techniques (技巧) which makes language learning easier for them.
(16) , successful language learners are independent learners. They do not depend on (依赖) books or teachers; they (17) their own way to learn the language. They try to find the patterns and the rules for themselves, (18) waiting for the teacher to explain everything. They are good guessers who look for clues to form their (19) conclusions which are very different from others’.
Successful language learning is (20) learning. Therefore, successful learners do not wait for a chance to use the language; they (21) such a chance. They find people who speak the language and ask these people to correct them (22) they make mistakes. They will try anything to communicate. When communication is difficult, they can (23) information that is incomplete (不完整的). It is more important for them to learn to (24) in the language than to know the meaning of every word.
Finally, successful language learners are learners with a (25) in order to communicate with these people and learn from them. They want to learn a language because they are interested in the language and the people who speak it. It is necessary for them to learn the language.

Ⅱ. 完形填空

/Close
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出一个最佳选项。

A．explain

B．make

C．discover

D．change

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