文献检索的步骤。

膀胱肿瘤T₁期表明肿瘤侵及

A．浅肌层
B．深肌层
C．外膜层
D．黏膜表面
E．黏膜固有层

下列标点符号使用有错误的一项是[ ]

A．他完全知道这件事应该不应该做？

B．她问我想吃什么，我想也没想，说饺子。

C．“老师”，马蒂尼里抽噎着说，“那条蜥蜴是我放在你抽屉里的。”

D．摆在我们面前的这本书——祁淑英、魏根发撰写，花山文艺出版社的传奇文学《钱学森》，一下子拉近了广大读者与这位“科学圣人”之间的距离。

在同一Word文本中，能实现复制文字块的操作是( )。

A．选定字块，按下Ctrl键，然后用鼠标拖动该字块到新位置

B．选定字块，再将要复制的字块“复制"到剪贴板上，最后将字块“粘贴"到新的位置

C．选定字块，然后用鼠标拖动该字块到新位置

D．选定字块，再将要复制的字块“剪切”到剪贴板上，最后将字块“粘贴”到新的位置

L、M和N三个人中的每一个人都从一街头小贩那里至少买一种食物，该小贩仅售F、H、P和S四种食物。他们根据以下条件来选择他们的食物：(1)每个人最多只买每种食物的一份；(2)若三个人中的某个人买了H，则他不买S；(3)至少有1个人买了H，至少有1个人买了P；(4)M买了S；(5)N买了F；(6)L和N不买P：(7)M和N不买同样的食物。

若L和M恰好都买了2种食物，则下面哪一项陈述一定正确

A．3

B．4

C．5

Mr. Faugel was convinced that student nervousness had affected their scores; to reduce the anxiety of these students who had already been tested, he gave 22 of them a beta blocker before readministration of the test. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nationwide had average improvements which were similar to those in Faugel’’s non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers.

Where is the only place a person can obtain beta blockers

A．Supermarket.

B．Convenience store.

C．Stationary store.

D．Doctor’s office.