队员运球后用双手触球的一刹那，使球在手中停顿的一刹那就算（）完毕。

放在水平面上的物体重为100N，物体和水平面间的动摩擦因数μ=0.20，先用水平拉力F₁拉物体，再换用水平拉力F₂拉物体（F₂＞F₁），则（　　）

A．若物体始终不动，则物体所受摩擦力的大小始终等于20N

B．若物体始终不动，则物体所受摩擦力的大小由F₁增至F₂

C．若在F₁的作用下物体就运动了，则物体所受摩擦力的大小始终等于20N

D．若在F₁的作用下物体就运动了，则物体所受摩擦力的大小由F₁增至F₂

Some insects _______ the colour of their surroundings to protect themselves.

A．take in

B．take off

C．take on

D．take out

男性，46岁。口渴、多饮、消瘦3个月，突发昏迷2日。血糖41mmol/L，血钠132mmol/L，血钾4.0mmol/L，尿素氮9.8mmol/L，COCP18.3mmol/L，尿糖、尿酮(+++)。

静滴胰岛素、碳酸氢钠约2小时，血糖降至16.7mmol/L，酸中毒改善，一度清醒后又陷入昏迷。此现像可能为()

A．并发脑水肿

B．并发脑血管意外

C．并发低血糖

D．并发尿毒症

E．并发乳酸性酸中毒

下面是一个Applet程序，其功能是用一组坐标点绘制一个多边形，并通过沿坐标的垂直方向移动，把它移到窗口的下半部分，然后填充它。请改正程序中的错误(有下划线的语句)，使程序能输出正确的结果。
注意：不改动程序的结构，不得增行或删行。
源程序文件清单如下：
import java.awt.*；
import java.applet．*；
/*
＜applet code="ex11_3．class"width=800 height=400＞
＜/applet＞
*/
public class ex11_3 extends Applet

int[] x = 15,50,100,160,120,190 ;
int[] y = 15,100,30, 15, 80, 50 ;
public void init()

setBackground (Color. lightGray);

public void paint (Graphics g)

int[] y2 = new int[6];
g. setColor (Color. red);
Rectangle rect = getBounds();
g.drawPolygon (x, y2,6);
for(int i=0; i＜6; i++)
y2[i] = y[i] + (rect.height / 2);
g. fillPolygon (x, y, 6);


ex11_3. html
＜HTML＞
＜HEAD＞
＜TITLE＞ex11_3＜/TITLE＞
＜/HEAD＞
＜BODY＞
＜applet code="ex11_3.class" width=800 height=400 ＞
＜/applet＞
＜/BODY＞
＜/HTML＞

Writing about music is like dancing about architecture, or so the saying goes. Sometimes attributed to Frank Zappa, other times to Elvis Costello, this quote is usually intended to convey the futility of such an endeavor, if not the complete silliness of even attempting it. But Glenn Kurtz’s graceful memoir, Practicing: A Musician’s Return to Music, turns the expression on its head, giving it a different meaning by creating a lovely, unique book.
Kurtz picked up the guitar as a kid in a music-loving family, attended the Long Island music school, and went on to play on Merv Griffin’s TV show before graduating from Tufts University. Motivating the young Kurtz was the dream of reinventing classical guitar, as if by his great ambition alone he could push it from the margins of popular interest to center stage-something not even accomplished by the late Spanish guitarist Andres Segovia, perhaps the only artist of the form ever to reach anything resembling widespread celebrity.
This book reads like a love story of sorts: Boy meets guitar. Boy loves guitar. Guitar breaks boy’s heart or, more precisely, the ordinariness of a working musician’s life does so. "I’d just imagined the artist’s life naively, childishly, with too much longing, too much poetry and innocence and purity," Kurtz writes. "The guitar had been the instrument of my dreams. Now the dream was over. "
Boy leaves guitar. Were the story to end here, this book would be a tragedy, but after nearly a decade the boy returns to guitar, and although he has lost the enthusiasm he had in his youth, he finds his love of the guitar again in a way he never could have appreciated before.
Although Kurtz is writing about a unique musical path, his journey speaks eloquently to the heart of anyone who has ever desperately yearned to achieve something and felt the sting of disappointment. "Everyone who gives up a serious childhood dream—of becoming an artist, a doctor, an engineer, an athlete—lives the rest of their life with a sense of loss, with nagging what it is," he writes. "Is that time and effort, that talent and ambition, truly wasted \

The author mentions "reinventing" underlined in Paragraph 2 is closest in meaning to ______.

A．reuse

B．innovate

C．recreate

D．reset