Which of the following is NOT the reason why we teach pronunciation（）
A. Pronunciation is the most important part in any language learning process
B. Good pronunciation is always important for students to achieve effective communication
C. To improve intelligibility in communication is one major reason for teaching pronunciation
D. Teaching pronunciation can also help students in other aspects of English learning
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Which of the following events is involved in the cleavage of the zygote during week 1 of development（）
A. Production of highly differentiated blastomeres
B. An increased cytoplasmic content of blastomeres
C. An increase in size of blastomeres
D. A decrease in size of blastomeres
Where do primordial germ cells initially develop（）
A. In the gonads at week 4 of embryonic development
B. In the yolk sac at week 4 of embryonic development
C. In the gonads at month 5 of embryonic development
D. In the gonads at puberty
Where does the blastocyst normally implant（）
A. Functional layer of the endometrium
Basal layer of the endometrium
C. Myometrium
D. Perimetrium
Which of the following components plays the most active role in invading the endometrium during blastocyst implantation（）
A. Epiblaslt
B. Syncytiotrophoblast
C. Hypoblast
D. Extraembryonic somatic mesoderm
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