资料：地域文化对人口的影响是通过影响人们的生育意愿而表现出来的，即人们的生育目的、对生育子女数量和性别的看法．据此回答下列下题．

若分式 $\frac{x-2}{\left|x\right|-1}$ 的值为0，则x的取值是（   ）

用所给动词的正确时态、语态填空
⑴Be quiet, please ! The baby____ (sleep).
⑵—What does Frank often do at weekends?
—He often____ (go) to the cinema with his parents.
⑶Andy ____ (argue) with his brother when I went to see him yesterday.
⑷She ____ (be) to her hometown several times.
⑸____ (play) computer games too much is bad for your eyes.
⑹Lucy tried ____(not make) too many mistakes in the exam.
⑺He ____  to us as soon as he gets there. (write)
⑻By the time I got outside, the bus____ (leave).
⑼I'm sure I ____  her four years ago. (see)
⑽In summer,  Miss Xia would rather ____  (stay) at home than go out.

调节镜筒下降时，眼睛应看着物镜，避免物镜压碎标本。

通电直导线周围的磁感线分布如图所示，磁感线是以直导线为中心的一系列的____，从图中可看出，磁感线是____（闭合/不闭合）的曲线；图中小磁针涂黑的磁极是____极．