下述有关甲状腺结节的描述，下列哪项是错误的（） A.多发结节多为良性结节 B.甲状腺

长期暴露在空气中的浓硫酸、浓盐酸、石灰石、火碱，其中质量会增加的是______（写化学式，下同），质量会减少的是______，质量不变的是______．

My friend often helps the old______.    [ ]

A. out    

B.  in    

C. without

《药品经营质量管理规范》的实施日期（）？

A.[1999-6-18]

B.[2000-7-1]

C.[2001-12-1]

D.[2000-1-1]

如图所示，小车的质量40kg．人的质量为60kg，人用恒力 500N拉绳，若人和车保持相对静止．不计绳和滑轮质量、车与地面的摩擦，则车对人的摩擦力是（  ）

A．0

B．200N，方向向右

C．100N，方向向左

D．100N，方向向右

选做题：阅读下面的短文，并根据短文的要求答题。（注意：问题后的词数要求。）

     The rise of the so-called "boomerang generation (回巢族)" is reported in official figures showing that

almost one in five graduates in their late 20s now live with their parents. By contrast, only one in eight

university graduates had failed to fly the nest by the same age 20 years ago, research from the Office for

National Statistics (ONS) shows.

     It also found that grown-up sons are twice as likely as their sisters to still be living with their parents

in their late 20s.

     With nearly a quarter of men approaching 30 still living at home, the findings are bound to lead to claims

of a "generation of mummy's boys".

     Rising housing prices, increasing student debts and the effects of depression on the job market have

forced a wave of young people to move back into the family home at an age when they would normally

_____.

     Young professionals in their late 20s or early 30s have been called the"boomerang generation" because

of the trend toward returning to the family home.

     Recent research has suggested that young people in Britain are twice as likely to choose to live with their

parents in their late 20s than their counterparts elsewhere in Europe.

     But experts warned that the phenomenon may have more to do with young people facing dark future than

simply a desire to save money.

     While the percentage of those of university or college age moving out from the family home has continued

to rise in the last 20 years, among those in their mid and late 20s the trend has reversed.

     Overall 1.7 million people aged from 22 to 29 now share a roof with their parents, including more than

760,000 in their late 20s, the ONS figures suggest.

1. What is the main idea of the passage? (Please answer within 15 words.)

    ______________________________________________________________________________________

2. Which sentence in the passage can be replaced by the following one? The survey showed that the number

    of young men living in the family home probable doubles that of young women in their late 20s.

    ______________________________________________________________________________________

3. Fill in the blank in the fourth paragraph with proper words or phrases to complete the sentence. (Please

    answer within 5 words.) 

    ______________________________________________________________________________________

4. List three factors that have driven young people back home again based on the passage.( Please answer

    within 5 words each). 

    ______________________________________________________________________________________

5. Translate the underlined sentence in the seventh paragraph into Chinese. 

    ______________________________________________________________________________________