皮皮学，免费搜题
登录
搜题
【简答题】
刺吸式口器是由咀嚼式口器演化而来的，（）退化成三角片状，贴唇槽上，（）和（）特化成4条口针，两下颚针嵌合成食物道和唾液道，（）延长形成喙管，用于保护口针。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】introductory offer
【单选题】Which is true about the general-to-specific pattern of introductory paragraph? ______.
A.
Writers usually present thesis statement at very beginning of the introductory paragraph
B.
Writers give readers very specific information that will become more and more general
C.
The introduction begins with general information and become more specific
D.
Lead-in is the most specific part in introductory paragraph
【单选题】Most embedded clauses require an introductory word called a subordinator, such as 'that, until, before, ______ 'and so on.
A.
so
B.
if
C.
for
D.
but
【单选题】关于应激性溃疡的临床特点，下列不正确的是
A.
常见诱因是严重烧伤、颅脑损伤、大手术或全身感染
B.
表现为急性弥漫性胃黏膜糜烂、出血或溃疡
C.
严重时可发生大出血或穿孔
D.
胃镜检查可证明病变
E.
一经诊断，应首先考虑外科手术治疗
【单选题】The passage implies that which of the following was true of introductory courses in Asian American studies a few decades ago?
A.
The range of different textbooks that could be assigned for such courses was extremely limited.
B.
The texts assigned as readings in such courses were often not very challenging for students.
C.
Students often complained about the texts assigned to them in such courses.
D.
Such courses were the only means then available by which people in the United States could acquire knowledge of the field.
E.
Few students wanted to take such courses.
相关题目：