臀先露对胎儿危害最大的是（）。 A.完全臀位 B.单臀位 C.足位 D.膝先露 E.

如图所示，跳台滑雪运动员经过一段加速滑行后从O点水平飞出，经过3.0s落到斜坡上的A点．已知O点是斜坡的起点，斜坡与水平面的夹角θ=37°．不计空气阻力．（取sin37°=0.60，cos37°=0.80；g取10m/s²）求

（1）A点与O点的距离；

（2）运动员离开O点时的速度大小．

日本民主党在2009年的国会众议院选举中战胜自民党，成为日本新的执政党。9月16日，民主党代表鸿山由纪夫正式当选日本首相，接受了明仁天皇的任命书，组建了包括国民新党党首龟井静香、社民党党首福岛瑞穗在内的新内阁。下列关于日本政体和政党制度的说法正确的是（　）

A．天皇是国家政治活动的中心

B．内阁为最高行政机关，对国会负责

C．首相既是政府首脑，又是国家元首

D．自民党与民主党相互对峙，轮流执政

Last week, while visiting my dad with my daughter, we went to a restaurant for dinner. When we were seated, my dad asked the waitress if there were any soldiers eating at the restaurant. Then waitress said there was a soldier having dinner with his friend. My dad told the waitress to tell the soldier and his friend that their dinner was paid for! He also said that he did not want to be known as the benefactor(施主).

Then waitress later commented on my dad’s thoughtful behavior saying that she had never seen anything like this before. At a local college, she had studied opera and so she used this to thank my dad by performing a piece from The Pearl Fisherman. Her voice brought me to tears because it sounded perfect!

After a while, the soldier appeared at our table (I don’t know how he knew my dad paid the bill for him.) and said that he would be sent to the front the next morning and that he could not leave this country without saying “thanks” to my dad. My dad replied that it was he who wanted to say “thanks”. They shook hands as the soldier left.

Before we left, the waitress came by again. She did a magic show as another way to show her

“thanks” to my dad. Her show was really great. My dad left her a note with email address asking for her next performance time in addition to a $ 50 tip.

Everyone witnessed something exemplary(可作榜样的) in the human spirit that night. I can only hope to see more of this in the future.

68．What did the soldier do in response to the author’s father’s kindness?

A．He gave something to author’s dad.

B．He gave a big tip to the waitress.

C．He said thanks to the author’s dad in person.

D．He did a magic show for the author and her father.

69．The author considered her father’s action to be ____.

A．funny       B．understandable C．worthless  D．honorable

70．Their passage mainly tells us that we should ____.

A．learn to be grateful to others B．find ways to thank others

C．try to learn from each other    D．respect soldiers and waitresses

有关肠源性感染的描述，哪一项是正确的

A．致病菌均为大肠杆菌

B．肠道内细菌和毒素可经肠道侵入播散全身

C．肠源性感染主要引起肠道功能失调

D．烧伤休克期足量高热卡饮食可改善肠道功能，降低肠源性感染的危险

E．烧伤休克期进食会加重肠源性感染的危险，应该禁食

下图为某动物细胞分裂的示意图，英文字母分别表示有丝分裂或减数分裂的不同时期，请据图回答：

含有同源染色体的时期是（）期