如何诊断与治疗选择性IgA缺乏症？

Have you e  1  planted a few trees on Tree Planting Day?

Each year, many of people, both old a  2 __ young, plant a lot of trees. But this may not be the best w 3  __to make your home a greener place. Last week, we v 4 __ a park in Hebei. We were s 5  __ to find most of the trees had been burnt. The workers told us that the trees d 6  _ soon after they were planted because they were not watered well enough. So the workers burnt them and changed the trees for new trees to be planted this year. On a card found in one of the trees, a student w 7 _ . “I hope this tree will g 8____up with me to become the backbone(栋梁) of our country.” The workers said that the survival of the trees was really more important t 9__ how many trees were planted.

Some people in Beijing now have a new idea that they can donate some m 10  and let professionals plant and take care of trees.

患者，女性，28岁，临床触诊，乳腺肿物圆形、界清、可移动。取活检组织，切面灰白，可见裂隙，镜下见乳腺小导管增生，管腔有的变细长，管腔周围有多量纤维组织增生，并疏松染成淡蓝色。此瘤可能诊断为（）

A.乳腺良性叶状肿瘤

B.乳腺腺病

C.乳腺纤维腺瘤

D.乳腺纤维瘤

E.以上都不是

有关肾母细胞瘤描述错误的是（）

A.又称Wilms瘤

B.来源于肾胚基细胞的恶性肿瘤

C.常累及双侧肾脏

D.多见于儿童，临床有腹部包块、腹痛及血尿

E.镜下可见原始小管结构、幼稚的胚胎间叶成分及肉瘤成分

有助于确定有无心包积液最简单、易行、可靠的方法是（）

A.心电图检查

B.X线胸片

C.心包活检

D.超声心动图

E.血液动力学监测

膨润土是一种良好的（），它能提高生球和干球的（）。