An astronaut is a person who travels in a .
A. train
B. spaceship
C. boat
D. bus
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To apply to some universities, you must fill out the application form and include a short autobiography.
A. account of your life written by yourself
B. list of courses you have taken
C. list of schools you have attended
D. list of authors you have read
Put the letter of the suitable definition next to each word.
脾脏是人体内最大的免疫器官，在这里产生淋巴细胞。
A. 淋巴细胞
B. 血液
C. 溶菌酶
D. 抗体
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