可屈0°～180°且伸0°～50°的关节是（）。 A.肩关节 B.肘关节 C.腕关节

根据短文内容判断正(T)误(F)

         Now many boys wear the same(同样的)  clothes as girls, and some of them have long hair. So

sometimes it's difficult to tell whether(是否) they are boys or girls.

        One Sunday morning,  I  go for a walk with my grandfather in the park near my house. After a

while, my grandfather is tired, so he sits down on a bench(长椅)near the pool.

        "Oh," my grandfather says to the person with long curly hair next to him on the bench. "Can you

see the person with long hair on the side of the pool? Is it a boy or a girl?"

        "Which one?" asks the person with long curly hair.

        "The one who is eating a hamburger near the pool, "says my grandfather.

        "He's a boy," says the person, "he's my son, Li Yu. " "Oh," my grandfather says, "I'm sorry. I

don't know you are his mother. "

        "No,I'm not his mother, I'm his father. "

( )1. The writer's house is near a post office.

( )2. One Sunday morning, the writer's grandfather goes shopping.

( )3. Li Yu's father has long curly hair.

( )4. LiYu is eating a hamburger.

( )5. Li Yu's father and the writer's grandfather sit on the same bench.

下列各句中，没有错别字的一组是

A．可今年是个暖冬，只下了很少一点雪 。几乎整个冬季，阳光闪亮。田里芳草青青，农民们把牲畜赶往农场。不过也都抱怨这样干燥的气候，会使整个冬季作物歉收的。

B．如果这个斑点是一只钉子留下的痕迹，那一定不是为了挂一幅油画，而是为了挂一幅小肖像画——一幅卷发上扑着白粉、脸上抹着脂粉、嘴唇像红石竹花的贵妇人肖像。它当然是一件膺品。

C．错误是在炮队队长身上，由于疏忽，他没有把铁链的镙丝帽旋紧，大炮下的四只滑轮也没有堵塞好；这样就使脚板和炮架有了活动的机会，一切的关键都没有合龙，所以那系炮的铁链，终于被挣断了。

D．天空轻盈，辽廓，深邃。朝阳从一旁照来，使得在雨后被大车碾得瓷瓷实实的道路好似浇了一层油，亮晶晶的。四周是一望无垠的大片大片倾斜的冬麦田。冬麦的禾苗，娇嫩、茁壮，青翠欲滴。

半径为R的圆管层流中流速为断面平均流速的位置为（）。

A.管轴上

B.管壁上

C.R处

D.R处

下列说法正确的是

A．浓硫酸在常温下可迅速与铜片反应放出二氧化硫气体

B．在含有Cu(NO₃)₂、Mg(NO₃)₂和AgNO₃的溶液中加入适量锌粉，首先置换出的是Cu

C．能与酸反应生成盐和水的氧化物一定是碱性氧化物

D．将Ba(OH)₂溶液滴到明矾溶液中，当SO₄^2-刚沉淀完时，铝以AlO₂^-的形式存在

应急准备