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中国抗日战争为什么能胜利？

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The article consists of three stories about (1)__. The first story is about a (2)_ named Wan Hu, who made an unsuccessful attempt at (3)_ in A.D. 1500. He built a spaceship powered by 47 rockets using (4)_ . His idea was (5)_, but his dream of flight (6)_ 500 years later when China successfully launched its first manned Shenzhou V spaceship. The second one is about the Spruce Goose, a (7) _ designed to meet the need of (8) troops and materials during World War II. It was made entirely of (9)_ and still holds the record for (10)_ . Although it was (11)_ put to use, many of its design features have been incorporated into today's (12) _. The last is about Leonardo da Vinci, the most famous artist of the Renaissance. Apart from his great artistic work, he also drew sketches of (13) _ with flapping wings controlled and steered by (14)_. (15)_ year later, a professional parachutist made a successful jump using a wood and canvas parachute based on one of (16)____.

局部放大图的比例是放大图与原图相应要素的线性尺寸之比。（）

A. 对
B. 错

打击乐演奏活动开始和结束时应注意的常规有( )。

A. 听音乐的信号,整齐地将乐器从座椅下面取出或放回。
B. 乐器拿出后,凡不演奏时须将乐器放在大腿上,不发出声音,眼睛也不看乐器。
C. 开始演奏前,按指挥者的手势整齐地将乐器拿起,做好准备演奏的姿势。演奏结束后,按指挥者的手势将乐器放回大腿上。
D. 活动结束后自己收拾乐器和整理场地。

学前儿童在活动进行时应做到( )。

A. 演奏时身体倾向指挥者,眼睛注视指挥者,积极地与指挥者交流。
B. 演奏时注意倾听音乐和同伴的演奏。
C. 演奏时注意力要集中,不做与演奏无关的事情。
D. 交换乐器时,须先将原来使用的乐器放在座椅上,再迅速无声地找到新乐器。交换过程中不与他人或场内的座椅碰撞。