报关员的注册条件为( )A．报关员必须取得报关从业资格 B．报关员必须受聘于报关单

下面是对某班同学就“家庭环境对你的学习是否有利”情况的调查结果：有利的30人，一般的18人，不利的12人．

（1）计算各类人数所占的百分比及各个扇形圆心角的度数．认为“有利的”百分比为_________，扇形圆心角的度数是_________°，认为“一般的”百分比为_________，扇形圆心角的度数是_________°，认为“不利的”百分比为_________，扇形圆心角的度数是_________°．

（2）制作扇形统计图，并标明各类的百分比．

若挡土墙的墙背竖直且光滑，墙后填土面水平，粘聚力c=0，采用朗肯解和库仑解，得到的主动土压力有何差异?()

A.朗肯解大

B.库仑解大

C.相同

当Gd-DTPA用于中枢神经系统检查时，以下哪项不是其特征()

A．鉴别水肿与病变组织

B．确定脑内或脑外肿瘤

C．发现平扫未发现的病变

D．完全判定肿瘤性病变与非肿瘤性病变

E．进一步显示肿瘤内部情况

以下哪些是JIT采购的特点（）

A.单源采购

B.采购质量高

C.小批量和多频次采购

D.信息共享程度好

There was a woman in Detroit, who had two sons. She was worried about them, especially the younger one, Ben, because he was not doing well in school. Boys in his class played jokes on him because he seemed so (21) The mother (22) that she would help her sons to do (23) in school by herself. She told them to go to the Detroit Public Library to (24) a book a week and do a book report for her.
One day, in Ben’s class, the teacher held up a rock and asked (25) anyone knew it. Ben put up his hand and the teacher let him (26) . "Why did Ben raise his hand" all of his (27) whispered (耳语) and wondered. "He (28) said anything. What could he possibly want to say" To their surprise, Ben not only (29) the rock, but also said a lot about it. He (30) other rocks in its group and even knew (31) the teacher had found it. The teacher and the other students were (32) Ben had learned this from doing one of his book (33) .
Later Ben became the (34) student of his class. When he finished high school, he went to Yale University and (34) became one of the best doctors in the United States.

Ⅱ. 完形填空

/Close
阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中选出一个最佳选项。

A．at first

B．at the end

C．at last

D．now