[单项选择]在家庭中，( )是儿童心理、行为异常的基本原因。
A. 爱的缺乏
B. 兄妹的排行
C. 教养方式
D. 家庭的不完满

The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage.
The complex life cycle of the Plasmodium protozoan, the causative agent of malaria, has contributed to the difficulty of devising effective public health measures to combat the disease. It took scientists centuries to deconstruct the basic relationship between protozoan, mosquito vector, and human host. Modern physiologists and epidemiologists are still working out the intricacies of malarial infection.
The disease is transmitted by the bite of a female Anopheles mosquito infected with the Plasmodium parasite. Only Anopheles mosquitoes are capable of transmitting the disease, and only females take blood meals from humans. To become infected with Plasmodium, the female mosquit
A. It summarizes two theories, the relative merits of which are debated in the passage.
B. It puts forth an argument that the rest of the passage is devoted to refuting.
C. It introduces a new concept that the rest of the passage expands upon.
D. It frames the background and relevance of the material to follow.
E. It outlines the major themes of each of the four paragraphs to follow.